GB2596175A - Additive manufacturing - Google Patents

Additive manufacturing Download PDF

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Publication number
GB2596175A
GB2596175A GB2102615.8A GB202102615A GB2596175A GB 2596175 A GB2596175 A GB 2596175A GB 202102615 A GB202102615 A GB 202102615A GB 2596175 A GB2596175 A GB 2596175A
Authority
GB
United Kingdom
Prior art keywords
powder
build
emitting device
energy emitting
transport path
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB2102615.8A
Other versions
GB202102615D0 (en
GB2596175B (en
Inventor
Gwilliam Crabtree Joseph
Rybalcenko Konstantin
Pap-Kovács Viktor
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Additive Manufacturing Technologies Ltd
Original Assignee
Additive Manufacturing Technologies Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Additive Manufacturing Technologies Ltd filed Critical Additive Manufacturing Technologies Ltd
Publication of GB202102615D0 publication Critical patent/GB202102615D0/en
Publication of GB2596175A publication Critical patent/GB2596175A/en
Application granted granted Critical
Publication of GB2596175B publication Critical patent/GB2596175B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
    • B29C64/10—Processes of additive manufacturing
    • B29C64/141—Processes of additive manufacturing using only solid materials
    • B29C64/153—Processes of additive manufacturing using only solid materials using layers of powder being selectively joined, e.g. by selective laser sintering or melting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
    • B22F10/20—Direct sintering or melting
    • B22F10/28—Powder bed fusion, e.g. selective laser melting [SLM] or electron beam melting [EBM]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F12/00—Apparatus or devices specially adapted for additive manufacturing; Auxiliary means for additive manufacturing; Combinations of additive manufacturing apparatus or devices with other processing apparatus or devices
    • B22F12/30—Platforms or substrates
    • B22F12/33—Platforms or substrates translatory in the deposition plane
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F12/00—Apparatus or devices specially adapted for additive manufacturing; Auxiliary means for additive manufacturing; Combinations of additive manufacturing apparatus or devices with other processing apparatus or devices
    • B22F12/40—Radiation means
    • B22F12/46—Radiation means with translatory movement
    • B22F12/48—Radiation means with translatory movement in height, e.g. perpendicular to the deposition plane
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F12/00—Apparatus or devices specially adapted for additive manufacturing; Auxiliary means for additive manufacturing; Combinations of additive manufacturing apparatus or devices with other processing apparatus or devices
    • B22F12/80—Plants, production lines or modules
    • B22F12/82—Combination of additive manufacturing apparatus or devices with other processing apparatus or devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F12/00—Apparatus or devices specially adapted for additive manufacturing; Auxiliary means for additive manufacturing; Combinations of additive manufacturing apparatus or devices with other processing apparatus or devices
    • B22F12/80—Plants, production lines or modules
    • B22F12/82—Combination of additive manufacturing apparatus or devices with other processing apparatus or devices
    • B22F12/84—Parallel processing within single device
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F12/00—Apparatus or devices specially adapted for additive manufacturing; Auxiliary means for additive manufacturing; Combinations of additive manufacturing apparatus or devices with other processing apparatus or devices
    • B22F12/80—Plants, production lines or modules
    • B22F12/82—Combination of additive manufacturing apparatus or devices with other processing apparatus or devices
    • B22F12/86—Serial processing with multiple devices grouped
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/10—Sintering only
    • B22F3/105—Sintering only by using electric current other than for infrared radiant energy, laser radiation or plasma ; by ultrasonic bonding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
    • B29C64/10—Processes of additive manufacturing
    • B29C64/171—Processes of additive manufacturing specially adapted for manufacturing multiple 3D objects
    • B29C64/176—Sequentially
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
    • B29C64/20—Apparatus for additive manufacturing; Details thereof or accessories therefor
    • B29C64/227—Driving means
    • B29C64/241—Driving means for rotary motion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
    • B29C64/20—Apparatus for additive manufacturing; Details thereof or accessories therefor
    • B29C64/255—Enclosures for the building material, e.g. powder containers
    • B29C64/259—Interchangeable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y10/00—Processes of additive manufacturing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y30/00—Apparatus for additive manufacturing; Details thereof or accessories therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y99/00—Subject matter not provided for in other groups of this subclass
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F12/00—Apparatus or devices specially adapted for additive manufacturing; Auxiliary means for additive manufacturing; Combinations of additive manufacturing apparatus or devices with other processing apparatus or devices
    • B22F12/22—Driving means
    • B22F12/222—Driving means for motion along a direction orthogonal to the plane of a layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F12/00—Apparatus or devices specially adapted for additive manufacturing; Auxiliary means for additive manufacturing; Combinations of additive manufacturing apparatus or devices with other processing apparatus or devices
    • B22F12/22—Driving means
    • B22F12/226—Driving means for rotary motion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F12/00—Apparatus or devices specially adapted for additive manufacturing; Auxiliary means for additive manufacturing; Combinations of additive manufacturing apparatus or devices with other processing apparatus or devices
    • B22F12/30—Platforms or substrates
    • B22F12/37—Rotatable
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Plasma & Fusion (AREA)
  • Powder Metallurgy (AREA)

Abstract

An apparatus (100) for additively manufacturing a part. The apparatus comprises a build bed (104) for supporting a powder material, a powder surface preparation device (106) for preparing a surface of the powder material and an energy emitting device (108) for energising the powder surface based on a desired part geometry. The build bed is controllably moveable along a closed loop transport path which extends around a horizontal axis. Advantageously, it has been found that the provision of a transport path which extends around a horizontal axis provides for more easy access to the parts located on said path. Subsequently, operational efficiency can be improved.

Claims (25)

Claims
1. An apparatus for additively manufacturing a part, the apparatus comprising: a plurality of build beds, each build bed having a powder supporting platform for supporting a powder material; at least one powder surface preparation device for preparing a surface of powder material supported on at least one of said build beds; and at least one energy emitting device for energising a powder surface prepared on at least one of said build beds based on a desired part geometry, wherein the plurality of build beds are controllably moveable along a closed loop transport path, and wherein the closed loop transport path extends around a horizontal axis.
2. The apparatus according to claim 1 , wherein the plurality of build beds are supported on a transporter which defines the closed loop transport path.
3. The apparatus according to claim 2, wherein the plurality of build beds are separable from the transporter
4. The apparatus according to any preceding claim, wherein movement of the plurality of build beds along the closed loop transport path is controlled by a controller based on the desired part geometry and/or the powder material and/or the energy emitting device
5. The apparatus according to any preceding claim, wherein the powder supporting platform of each of the plurality of build beds is controllably moveable between a first position and a second position for adjusting a height of said powder supporting platform
6. The apparatus according to claim 5, wherein the apparatus is configured such that the at least one powder surface preparation device and/or the energy emitting device are located above the powder support platform of at least one of said build beds when preparing or energising the surface of the powder material, and wherein the powder supporting platform of said build beds is controllably moveable between a first position and a second position for adjusting a clearance between the powder material and the at least one powder surface preparation device and/or the energy emitting device .
7. The apparatus according to any preceding claim, wherein the at least one powder surface preparation device and/or the energy emitting device is controllably moveable between a first position and a second position for adjusting a height of the at least one powder surface preparation device and/or the energy emitting device.
8. The apparatus according to claim 7, wherein the apparatus is configured such that the at least one powder surface preparation device and/or the energy emitting device are located above the powder support platform of at least one of said build beds when preparing or energising the surface of the powder material supported by said build beds, and wherein the at least one powder surface preparation device and/or the energy emitting device is controllably moveable between a first position and a second position for adjusting a clearance between the powder material and the at least one powder surface preparation device and/or the energy emitting device.
9. The apparatus according to any preceding claim, further comprising at least one curing device located on the closed loop transport path, upstream and/or downstream of the at least one energy emitting device for curing the powder material before or after the powder material has been energised.
10. An additive manufacturing system comprising the apparatus according to any preceding claim.
11. A method of additively manufacturing a part, comprising: providing a plurality of build beds each build bed having a powder supporting platform, the powder supporting platform of at least one of said build beds supporting a powder material; preparing a surface of the powder material supported on at least one of said build beds by at least one powder surface preparation device; controllably moving the plurality of build beds along a closed loop transport path, the closed loop transport path extending around a horizontal axis, and energising the powder surface prepared by the at least one powder surface preparation device based on a desired part geometry.
12. The method according to claim 1 1 , wherein the plurality of build beds are supported on a transporter defining the closed loop transport path, and wherein the method further comprises removing at least one of the plurality of build beds from the transporter after the powder surface has been energised by the at least one energy emitting device.
13. The method according to claim 12, wherein the method further comprises replacing the at least one build bed on the transporter after the at least one build bed has been removed from the transporter.
14. The method according to claim 1 1 , 12 or 13, wherein the plurality of build beds are supported on a transporter defining the closed loop transport path, and wherein the method further comprises placing an additional build bed onto the transporter.
15. The method according to any of claims 1 1 to 14 comprising: moving the plurality of build beds along the closed loop transport path based on the desired part geometry and/or the powder material and/or the energy emitting device.
16. The method according to any of claims 1 1 to 15, further comprising: moving the powder supporting platform of at least one of said build beds between a first position and a second position so as to adjust a height of said powder supporting platform.
17. The method according to claim 16, further comprises: locating the at least one powder surface preparation device and/or the energy emitting device above the closed loop transport path whilst preparing or energising the surface of the powder material, and moving the powder supporting platform of at least one of said build beds between a first position and a second position so as to adjust a clearance between the powder material and the at least one powder surface preparation device and/or the energy emitting device.
18. The method according to any of claims 1 1 to 17, further comprising: moving the at least one powder surface preparation device and/or the energy emitting device between a first position and a second position so as to adjust a height of the at least one powder surface preparation device and/or the energy emitting device.
19. The method according to claim 18, further comprises: locating the at least one powder surface preparation device and/or the energy emitting device above the closed loop transport path whilst preparing or energising the surface of the powder material, and moving the at least one powder surface preparation device and/or the energy emitting device between a first position and a second position so as to adjust a clearance between the powder material supported and the at least one powder surface preparation device and/or the energy emitting device.
20. The method according to any of claims 1 1 to 19, comprising: curing the powder material by at least one curing device located on the closed loop transport path upstream and/or downstream of the at least one energy emitting device.
21. The method according to any of claims 1 1 to 20, comprising: moving the plurality of build beds around the transport path a plurality of times until the desired part has been formed.
22. The method according to any of claims 1 1 to 21 , wherein energising comprises laser sintering/fusing.
23. The method according to any of claims 1 1 to 22, wherein the powder material comprises Nylon.
24. An apparatus for additively manufacturing a part, comprising: a plurality of build beds, each build bed having a powder supporting platform for supporting a powder material; at least one powder surface preparation device for preparing a surface of the powder material supported on at least one of said build beds; and at least one energy emitting device for energising the powder surface prepared on at least one of said build beds based on a desired part geometry, wherein the plurality of build beds are controllably moveable along a closed loop transport path, and wherein the at least one powder surface preparation device and the energy emitting device are controllably moveable along the closed loop transport path for accessing at least one of the plurality of build beds.
25. A method of additively manufacturing a part, comprising: providing a plurality of build beds each build bed having a powder supporting platform, the powder supporting platform of at least one of said build beds supporting a powder material; controllably moving the plurality of build beds along a closed loop transport path; controllably moving at least one powder surface preparation device along the closed loop transport path so as to access the powder material supported by at least one of said build beds; preparing a surface of the powder material supported by at least one of said build beds by the at least one powder surface preparation device; controllably moving at least one energy emitting device along the closed loop transport path so as to access the powder material prepared by the at least one powder surface preparation device; and energising the powder surface prepared by the at least one powder surface preparation device based on a desired part geometry.
GB2102615.8A 2019-04-05 2020-04-06 Additive manufacturing Active GB2596175B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB1904816.4A GB201904816D0 (en) 2019-04-05 2019-04-05 Additive manufacturing
PCT/EP2020/059795 WO2020201581A1 (en) 2019-04-05 2020-04-06 Additive manufacturing

Publications (3)

Publication Number Publication Date
GB202102615D0 GB202102615D0 (en) 2021-04-07
GB2596175A true GB2596175A (en) 2021-12-22
GB2596175B GB2596175B (en) 2022-06-15

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GBGB1904816.4A Ceased GB201904816D0 (en) 2019-04-05 2019-04-05 Additive manufacturing
GB2102615.8A Active GB2596175B (en) 2019-04-05 2020-04-06 Additive manufacturing

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GBGB1904816.4A Ceased GB201904816D0 (en) 2019-04-05 2019-04-05 Additive manufacturing

Country Status (3)

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EP (1) EP3946899A1 (en)
GB (2) GB201904816D0 (en)
WO (1) WO2020201581A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4134226A1 (en) * 2021-08-11 2023-02-15 Essilor International Manufacturing system configured to carry out a method for additively manufacturing a plurality of ophthalmic devices and such a method
CN115156560A (en) * 2022-09-06 2022-10-11 杭州爱新凯科技有限公司 Super large breadth 3D printing apparatus

Citations (5)

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US20060108712A1 (en) * 2002-08-02 2006-05-25 Eos Gmbh Electro Optical Systems Device and method for producing a three-dimensional object by means of a generative production method
US20130108726A1 (en) * 2011-03-02 2013-05-02 Bego Medical Gmbh Device for the generative manufacturing of three-dimensional components
US20160279705A1 (en) * 2015-03-27 2016-09-29 Delavan Inc Additive manufacturing systems and methods
EP3124140A2 (en) * 2015-07-29 2017-02-01 General Electric Company Apparatus with a build module and methods for production additive manufacturing
WO2018111240A1 (en) * 2016-12-13 2018-06-21 Statasys, Inc. Rotary silo additive manufacturing system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060108712A1 (en) * 2002-08-02 2006-05-25 Eos Gmbh Electro Optical Systems Device and method for producing a three-dimensional object by means of a generative production method
US20130108726A1 (en) * 2011-03-02 2013-05-02 Bego Medical Gmbh Device for the generative manufacturing of three-dimensional components
US20160279705A1 (en) * 2015-03-27 2016-09-29 Delavan Inc Additive manufacturing systems and methods
EP3124140A2 (en) * 2015-07-29 2017-02-01 General Electric Company Apparatus with a build module and methods for production additive manufacturing
WO2018111240A1 (en) * 2016-12-13 2018-06-21 Statasys, Inc. Rotary silo additive manufacturing system

Also Published As

Publication number Publication date
GB202102615D0 (en) 2021-04-07
EP3946899A1 (en) 2022-02-09
GB2596175B (en) 2022-06-15
WO2020201581A1 (en) 2020-10-08
GB201904816D0 (en) 2019-05-22

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