GB1552714A - Switching apparatus - Google Patents

Switching apparatus

Info

Publication number
GB1552714A
GB1552714A GB2269977A GB2269977A GB1552714A GB 1552714 A GB1552714 A GB 1552714A GB 2269977 A GB2269977 A GB 2269977A GB 2269977 A GB2269977 A GB 2269977A GB 1552714 A GB1552714 A GB 1552714A
Authority
GB
United Kingdom
Prior art keywords
switching apparatus
switching
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.)
Expired
Application number
GB2269977A
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.)
Bureau de Recherches Geologiques et Minieres BRGM
Original Assignee
Bureau de Recherches Geologiques et Minieres BRGM
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
Priority claimed from FR7616302A external-priority patent/FR2353876A1/en
Priority claimed from FR7636450A external-priority patent/FR2373078A2/en
Application filed by Bureau de Recherches Geologiques et Minieres BRGM filed Critical Bureau de Recherches Geologiques et Minieres BRGM
Publication of GB1552714A publication Critical patent/GB1552714A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B27/00—Photographic printing apparatus
    • G03B27/72—Controlling or varying light intensity, spectral composition, or exposure time in photographic printing apparatus

Landscapes

  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • General Physics & Mathematics (AREA)
  • Projection-Type Copiers In General (AREA)
GB2269977A 1976-05-31 1977-05-30 Switching apparatus Expired GB1552714A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7616302A FR2353876A1 (en) 1976-05-31 1976-05-31 Control of exposure time of photo-sensitive layer - uses series of electro luminescent diodes to indicate quantity of light received by photocell
FR7636450A FR2373078A2 (en) 1976-12-03 1976-12-03 Control of exposure time of photo-sensitive layer - uses series of electro luminescent diodes to indicate quantity of light received by photocell

Publications (1)

Publication Number Publication Date
GB1552714A true GB1552714A (en) 1979-09-19

Family

ID=26219460

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2269977A Expired GB1552714A (en) 1976-05-31 1977-05-30 Switching apparatus

Country Status (3)

Country Link
DE (1) DE2723794A1 (en)
GB (1) GB1552714A (en)
NL (1) NL7705849A (en)

Also Published As

Publication number Publication date
NL7705849A (en) 1977-12-02
DE2723794A1 (en) 1977-12-15

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee