FR714816A - Improvement in projection devices - Google Patents

Improvement in projection devices

Info

Publication number
FR714816A
FR714816A FR714816DA FR714816A FR 714816 A FR714816 A FR 714816A FR 714816D A FR714816D A FR 714816DA FR 714816 A FR714816 A FR 714816A
Authority
FR
France
Prior art keywords
improvement
projection devices
projection
devices
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
Henri-Francois-Etien Dusseri
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 FR714816A publication Critical patent/FR714816A/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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
FR714816D 1931-04-04 1931-04-04 Improvement in projection devices Expired FR714816A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR714816T 1931-04-04

Publications (1)

Publication Number Publication Date
FR714816A true FR714816A (en) 1931-11-20

Family

ID=9088613

Family Applications (1)

Application Number Title Priority Date Filing Date
FR714816D Expired FR714816A (en) 1931-04-04 1931-04-04 Improvement in projection devices

Country Status (1)

Country Link
FR (1) FR714816A (en)

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