EP0172544A3 - Process for manufacturing rolled steel products, in particular helically ribbed prestressed steel rods - Google Patents

Process for manufacturing rolled steel products, in particular helically ribbed prestressed steel rods Download PDF

Info

Publication number
EP0172544A3
EP0172544A3 EP85110316A EP85110316A EP0172544A3 EP 0172544 A3 EP0172544 A3 EP 0172544A3 EP 85110316 A EP85110316 A EP 85110316A EP 85110316 A EP85110316 A EP 85110316A EP 0172544 A3 EP0172544 A3 EP 0172544A3
Authority
EP
European Patent Office
Prior art keywords
steel
content
martensite
rods
tension
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
EP85110316A
Other languages
German (de)
Other versions
EP0172544B2 (en
EP0172544B1 (en
EP0172544A2 (en
Inventor
& Widmann Aktiengesellschaft Dyckerhoff
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.)
*DYWIDAG-SYSTEMS INTERNATIONAL G.M.B.H.
STAHLWERK ANNAHUTTE MAX *AICHER G.M.B.H. & CO.K.G.
Original Assignee
Dyckerhoff and Widmann AG
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6243708&utm_source=***_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0172544(A3) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Dyckerhoff and Widmann AG filed Critical Dyckerhoff and Widmann AG
Priority to AT85110316T priority Critical patent/ATE49779T1/en
Publication of EP0172544A2 publication Critical patent/EP0172544A2/en
Publication of EP0172544A3 publication Critical patent/EP0172544A3/en
Application granted granted Critical
Publication of EP0172544B1 publication Critical patent/EP0172544B1/en
Publication of EP0172544B2 publication Critical patent/EP0172544B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
    • C21D8/08—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires for concrete reinforcement
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S148/00—Metal treatment
    • Y10S148/902—Metal treatment having portions of differing metallurgical properties or characteristics
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S148/00—Metal treatment
    • Y10S148/902—Metal treatment having portions of differing metallurgical properties or characteristics
    • Y10S148/907—Threaded or headed fastener

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Physics & Mathematics (AREA)
  • Manufacturing & Machinery (AREA)
  • Heat Treatment Of Steel (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Heat Treatment Of Articles (AREA)
  • Laminated Bodies (AREA)
  • Rod-Shaped Construction Members (AREA)
  • Metal Rolling (AREA)
  • Coating With Molten Metal (AREA)

Abstract

To produce threaded steel tension members, steel is used with a C-content of 0.50 to 0.80%, preferably 0.75%, a Si-content of 0.20 to 0.50%, preferably 0.25%, and a Mn content of 0.30 to 0.80%, preferably 0.60%. Exiting from the rolling heat at the outlet side of the finishing stand after hot rolling, the tension member or rod is subjected to surface quenching by a cooling medium, preferably water, so that the steel in a rim zone R1 is transformed immediately and completely into martensite, while the heat content remaining in the core zone K1 does not effect a tempering of the martensite rim zone during the subsequent cooling beyond the range of the intermediate stage. Steel tension members of this type have a high ductility and toughness at a high yield limit and high strength, they are corrosion-resistant to a great degree and have a wear resistant surface which makes them particularly suitable for threaded tension rods in which the threads are produced either by a cold forming operation or hot rolled ribs.
EP85110316A 1984-08-23 1985-08-17 Process for heat treating hot rolled steel rod or wire for prestressing concrete Expired - Lifetime EP0172544B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85110316T ATE49779T1 (en) 1984-08-23 1985-08-17 PROCESS FOR THE MANUFACTURE OF ROLLED STEEL PRODUCTS, IN PARTICULAR SCREWABLE PRE-STEELS OR THE LIKE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3431008A DE3431008C2 (en) 1984-08-23 1984-08-23 Heat treatment of hot rolled bars or wires
DE3431008 1984-08-23

Publications (4)

Publication Number Publication Date
EP0172544A2 EP0172544A2 (en) 1986-02-26
EP0172544A3 true EP0172544A3 (en) 1987-10-28
EP0172544B1 EP0172544B1 (en) 1990-01-24
EP0172544B2 EP0172544B2 (en) 1996-06-05

Family

ID=6243708

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85110316A Expired - Lifetime EP0172544B2 (en) 1984-08-23 1985-08-17 Process for heat treating hot rolled steel rod or wire for prestressing concrete

Country Status (10)

Country Link
US (1) US4877463A (en)
EP (1) EP0172544B2 (en)
JP (1) JPH0660350B2 (en)
AT (1) ATE49779T1 (en)
AU (1) AU565805B2 (en)
BR (1) BR8504032A (en)
CA (1) CA1268957A (en)
DE (2) DE3431008C2 (en)
ES (1) ES8609490A1 (en)
ZA (1) ZA856448B (en)

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3431008C2 (en) 1984-08-23 1986-10-16 Dyckerhoff & Widmann AG, 8000 München Heat treatment of hot rolled bars or wires
DE3631928C2 (en) * 1986-09-19 1994-06-09 Aicher Max Process for the production of rolled steel products
DE8717648U1 (en) * 1987-09-11 1989-09-28 ARBED S.A., Luxemburg/Luxembourg Hot-rolled concrete reinforcing bar, in particular concrete ribbed bar
DE3730489A1 (en) * 1987-09-11 1989-03-30 Dyckerhoff & Widmann Ag CONCRETE REINFORCEMENT BAR, PARTICULAR CONCRETE RIB BAR
DE4224222A1 (en) * 1992-07-22 1994-01-27 Inst Stahlbeton Bewehrung Ev Structural steel, in particular rebar and process for its manufacture
GB9310854D0 (en) * 1993-05-26 1993-07-14 Asw Ltd Steel bars and rods and manufacturing process
DE29709213U1 (en) * 1997-05-26 1998-09-24 MiTek Industries GmbH, 63128 Dietzenbach Tensioning or fastening screw, in particular pipe screw
CA2292166A1 (en) 1999-01-13 2000-07-13 Kent B. Godsted Chemically coated fasteners having improved penetration and withdrawal resistance
US6086305A (en) 1999-01-13 2000-07-11 Illinois Tool Works Inc. Nails having selected heat treatment and hardening
US6109851A (en) 1999-01-13 2000-08-29 Illinois Tool Works Inc. Screws having selected heat treatment and hardening
DE19921286A1 (en) * 1999-05-07 2000-11-09 Sms Demag Ag Heat treatment process for the production of surface-hardened long and flat products from unalloyed or low-alloy steels
ITMI20031031A1 (en) * 2003-05-22 2004-11-23 Danieli Off Mecc METALLIC SPOOLING METHOD IN BAR.
US7624556B2 (en) 2003-11-25 2009-12-01 Bbv Vorspanntechnik Gmbh Threaded deformed reinforcing bar and method for making the bar
US8997420B2 (en) * 2004-11-29 2015-04-07 Victor Amend Reinforced insulated forms for constructing concrete walls and floors
CN1327008C (en) * 2005-07-07 2007-07-18 东北大学 Post rolling fast cooling-production technology of high strength ribbed reinforced bar
DE202010006059U1 (en) * 2010-04-23 2010-07-22 Stahlwerk Annahütte Max Aicher GmbH & Co KG threaded rod
AU2013205904B2 (en) * 2012-05-17 2017-12-07 Woodstock Percussion Pty Ltd Full Strength Threaded Bar
CZ307645B6 (en) * 2017-02-15 2019-01-30 Západočeská Univerzita V Plzni Method of manufacturing steel parts

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH364886A (en) * 1958-08-13 1962-10-15 Dyckerhoff & Widmann Ag Reinforcing bar for prestressed concrete
DE1913758A1 (en) * 1968-03-18 1969-10-09 United States Steel Corp Cold drawn wires from hot rolled steel bar and process for their manufacture
DE2163163B2 (en) * 1971-12-20 1972-11-30 Fried. Krupp Hüttenwerke AG, 4630 Bochum High strength steel - for wire having a sorbitic structure
DE2439784A1 (en) * 1973-09-24 1975-04-03 Qualitaets Und Edelstahl Kom V Concrete reinforcing rods - are quenched after hot rolling and profiling
BE874535A (en) * 1979-02-28 1979-06-18 Centre Rech Metallurgique PROCESS FOR MANUFACTURING HIGH ELASTIC LIMIT STEEL LAMINATED PRODUCTS
DE3131078C1 (en) * 1981-08-06 1982-10-28 Dyckerhoff & Widmann AG, 8000 München Anchoring or connecting body for steel bars having surface profilings in the form of ribs

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE137729C (en) *
BE790867A (en) * 1972-10-31 1973-02-15 Centre Rech Metallurgique PROCESS FOR IMPROVING THE QUALITY OF LAMINATED PRODUCTS, SUCH AS ROUND OR CONCRETE BARS, MACHINE WIRE, ETC ....
DE2353034B2 (en) * 1972-10-31 1980-03-13 Centre De Recherches Metallurgiques- Centrum Voor Research In De Metallurgie, Bruessel Process for improving the mechanical strength values of rolled steel products
FR2238768A1 (en) * 1973-07-23 1975-02-21 Sgtm Thermo-mechanical treatment of austenitic steel - followed by controlled quenching giving mech props similar to expensive alloys
US4180418A (en) * 1973-09-11 1979-12-25 Stahlwerke Peine-Salzgitter A.G. Method of making a steel wire adapted for cold drawing
IT1090143B (en) * 1975-01-29 1985-06-18 Centre Rech Metallurgique PROCESS FOR MANUFACTURING LAMINATED STEEL PRODUCTS
NL7610472A (en) * 1975-09-30 1977-04-01 Arbed PROCESS FOR TREATMENT OF ROLLED STEEL.
IT1107284B (en) * 1977-05-13 1985-11-25 Centre Rech Metallurgique PROCEDURE FOR THE PRODUCTION OF IMPROVED QUALITY STEEL PROFILES
GB1576944A (en) 1977-06-20 1980-10-15 British Steel Corp Production of steeel rod or bar
GB1587215A (en) * 1977-11-03 1981-04-01 British Steel Corp Manufacture of welded steel mesh
ES470858A1 (en) 1977-06-20 1979-10-01 British Steel Corp Welded steel rod grid prodn. for use as concrete reinforcement - by hot rolling steel into rod, water cooling, air cooling to temper the surface and welding to form grid
DE2844331A1 (en) * 1977-10-14 1979-04-19 Centre Rech Metallurgique METHOD FOR TREATMENT OF TUBULAR STEEL PROFILES
DE2900271C2 (en) 1979-01-05 1984-01-26 Stahlwerke Peine-Salzgitter Ag, 3150 Peine Weldable reinforcing steel and process for its manufacture
DE2916218A1 (en) * 1979-04-21 1980-10-23 Florin Stahl Walzwerk Rolled steel prods. with multilayer microstructure - where prod. leaving hot rolling mill is quenched intermittently to obtain several layers of tempered martensite
DE3431008C2 (en) 1984-08-23 1986-10-16 Dyckerhoff & Widmann AG, 8000 München Heat treatment of hot rolled bars or wires

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH364886A (en) * 1958-08-13 1962-10-15 Dyckerhoff & Widmann Ag Reinforcing bar for prestressed concrete
DE1913758A1 (en) * 1968-03-18 1969-10-09 United States Steel Corp Cold drawn wires from hot rolled steel bar and process for their manufacture
DE2163163B2 (en) * 1971-12-20 1972-11-30 Fried. Krupp Hüttenwerke AG, 4630 Bochum High strength steel - for wire having a sorbitic structure
DE2439784A1 (en) * 1973-09-24 1975-04-03 Qualitaets Und Edelstahl Kom V Concrete reinforcing rods - are quenched after hot rolling and profiling
BE874535A (en) * 1979-02-28 1979-06-18 Centre Rech Metallurgique PROCESS FOR MANUFACTURING HIGH ELASTIC LIMIT STEEL LAMINATED PRODUCTS
DE3131078C1 (en) * 1981-08-06 1982-10-28 Dyckerhoff & Widmann AG, 8000 München Anchoring or connecting body for steel bars having surface profilings in the form of ribs

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
IRON AND STEEL ENGINEER, Band 61, Nr. 3, März 1984, Seiten 53-57, Pittsburgh, Pennsylvania, US; P. SIMON et al.: "Tempcore: a new process for the production of high-quality reinforcing bars" *

Also Published As

Publication number Publication date
DE3431008A1 (en) 1986-03-06
ES8609490A1 (en) 1986-07-16
JPH0660350B2 (en) 1994-08-10
DE3575577D1 (en) 1990-03-01
EP0172544B2 (en) 1996-06-05
AU4658285A (en) 1986-02-27
US4877463A (en) 1989-10-31
EP0172544B1 (en) 1990-01-24
BR8504032A (en) 1986-06-10
ATE49779T1 (en) 1990-02-15
EP0172544A2 (en) 1986-02-26
JPS6160824A (en) 1986-03-28
DE3431008C2 (en) 1986-10-16
ES546332A0 (en) 1986-07-16
CA1268957A (en) 1990-05-15
AU565805B2 (en) 1987-10-01
ZA856448B (en) 1986-04-30

Similar Documents

Publication Publication Date Title
EP0172544A3 (en) Process for manufacturing rolled steel products, in particular helically ribbed prestressed steel rods
US4016009A (en) Producing rolled steel products
US4040872A (en) Process for strengthening of carbon steels
DE3127373C2 (en) Process for the manufacture of seamless steel tubes for the petroleum industry
BR8707822A (en) PROCESS FOR THE MANUFACTURE OF LAMINATED STEEL PRODUCTS
JPS6219488B2 (en)
US4775429A (en) Large diameter high strength rolled steel bar and a process for the production of the same
JPS5782432A (en) Production of high tensile wire rod
JPS5839737A (en) Manufacture of high tensile wire rod
JPS56102519A (en) Cold rolling method for stainless steel of high strength
DE2746961A1 (en) DEVICE AND METHOD FOR TENDERING OF HOT-ROLLED STEEL BARS
JPS5831031A (en) Production of steel pipe having high strength and toughness
US3251215A (en) Process for making rails
US3088855A (en) Metallurgical process and steels manufactured by same
JPS57134515A (en) Production of high tension bolt
RU2085596C1 (en) Method of heat treatment of pipes
JPS6487749A (en) Non-heattreated high-strength steel wire for spring
JPS5933175B2 (en) Manufacturing method of high-tensile wire rod
SU863676A1 (en) Method of working low-carbon and low-alloy steel preferably thin-wall irregularly shaped profiles
GB1563919A (en) Controlled cooling of hot-rolled steel products
RU1786115C (en) Process for producing heat treated rolled low-carbon and low-alloy steels
SU1390246A1 (en) Method of manufacturing reinforcement bars from low-carbon and low-alloyed steel
JPS6043892B2 (en) High tensile strength wire manufacturing method
Russwurm et al. Method for Manufacturing Rolled Steel Products
JPS61296901A (en) Continuous rolling installation for steel wire

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): AT BE DE FR GB IT LU

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): AT BE DE FR GB IT LU

17P Request for examination filed

Effective date: 19871217

17Q First examination report despatched

Effective date: 19890131

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE DE FR GB IT LU

REF Corresponds to:

Ref document number: 49779

Country of ref document: AT

Date of ref document: 19900215

Kind code of ref document: T

REF Corresponds to:

Ref document number: 3575577

Country of ref document: DE

Date of ref document: 19900301

ET Fr: translation filed
ITF It: translation for a ep patent filed

Owner name: JACOBACCI & PERANI S.P.A.

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
PLBI Opposition filed

Free format text: ORIGINAL CODE: 0009260

26 Opposition filed

Opponent name: ASW CONSTRUCTION SYSTEMS LTD.

Effective date: 19901023

ITTA It: last paid annual fee
EPTA Lu: last paid annual fee
PLAW Interlocutory decision in opposition

Free format text: ORIGINAL CODE: EPIDOS IDOP

PUAH Patent maintained in amended form

Free format text: ORIGINAL CODE: 0009272

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: PATENT MAINTAINED AS AMENDED

27A Patent maintained in amended form

Effective date: 19960605

AK Designated contracting states

Kind code of ref document: B2

Designated state(s): AT BE DE FR GB IT LU

RAP2 Party data changed (patent owner data changed or rights of a patent transferred)

Owner name: STAHLWERK ANNAHUETTE MAX AICHER GMBH & CO. KG.

Owner name: DYCKERHOFF & WIDMANN AKTIENGESELLSCHAFT

ITF It: translation for a ep patent filed

Owner name: JACOBACCI & PERANI S.P.A.

GBTA Gb: translation of amended ep patent filed (gb section 77(6)(b)/1977)

Effective date: 19960807

ET3 Fr: translation filed ** decision concerning opposition
REG Reference to a national code

Ref country code: GB

Ref legal event code: 732E

APAC Appeal dossier modified

Free format text: ORIGINAL CODE: EPIDOS NOAPO

APAC Appeal dossier modified

Free format text: ORIGINAL CODE: EPIDOS NOAPO

REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

REG Reference to a national code

Ref country code: GB

Ref legal event code: 732E

BECA Be: change of holder's address

Owner name: STAHLWERK ANNAHUTTE MAX *AICHER G.M.B.H. & CO.K.G.

Effective date: 20030423

Owner name: *DYWIDAG-SYSTEMS INTERNATIONAL G.M.B.H.

Effective date: 20030423

BECH Be: change of holder

Owner name: STAHLWERK ANNAHUTTE MAX *AICHER G.M.B.H. & CO.K.G.

Effective date: 20030423

Owner name: *DYWIDAG-SYSTEMS INTERNATIONAL G.M.B.H.

Effective date: 20030423

REG Reference to a national code

Ref country code: GB

Ref legal event code: 732E

REG Reference to a national code

Ref country code: FR

Ref legal event code: TP

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20040805

Year of fee payment: 20

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 20040818

Year of fee payment: 20

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20040819

Year of fee payment: 20

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 20040823

Year of fee payment: 20

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: LU

Payment date: 20040824

Year of fee payment: 20

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20041019

Year of fee payment: 20

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF EXPIRATION OF PROTECTION

Effective date: 20050816

BE20 Be: patent expired

Owner name: STAHLWERK ANNAHUTTE MAX *AICHER G.M.B.H. & CO.K.G.

Effective date: 20050817

Owner name: *DYWIDAG-SYSTEMS INTERNATIONAL G.M.B.H.

Effective date: 20050817

REG Reference to a national code

Ref country code: GB

Ref legal event code: PE20

APAH Appeal reference modified

Free format text: ORIGINAL CODE: EPIDOSCREFNO

BE20 Be: patent expired

Owner name: STAHLWERK ANNAHUTTE MAX *AICHER G.M.B.H. & CO.K.G.

Effective date: 20050817

Owner name: *DYWIDAG-SYSTEMS INTERNATIONAL G.M.B.H.

Effective date: 20050817