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FR640039A - Improvements in photography - Google Patents

Improvements in photography

Info

Publication number
FR640039A
FR640039A FR640039DA FR640039A FR 640039 A FR640039 A FR 640039A FR 640039D A FR640039D A FR 640039DA FR 640039 A FR640039 A FR 640039A
Authority
FR
France
Prior art keywords
photography
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
Other languages
French (fr)
Inventor
Ludwig-Maria Dieterich
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 filed Critical
Application granted granted Critical
Publication of FR640039A publication Critical patent/FR640039A/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
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/54—Accessories
    • G03B21/56—Projection screens
    • G03B21/60—Projection screens characterised by the nature of the surface

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
FR640039D 1927-08-26 1927-08-26 Improvements in photography Expired FR640039A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR640039T 1927-08-26

Publications (1)

Publication Number Publication Date
FR640039A true FR640039A (en) 1928-07-04

Family

ID=8997183

Family Applications (1)

Application Number Title Priority Date Filing Date
FR640039D Expired FR640039A (en) 1927-08-26 1927-08-26 Improvements in photography

Country Status (1)

Country Link
FR (1) FR640039A (en)

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