FR557154A - Improvements to projection devices - Google Patents

Improvements to projection devices

Info

Publication number
FR557154A
FR557154A FR557154DA FR557154A FR 557154 A FR557154 A FR 557154A FR 557154D A FR557154D A FR 557154DA FR 557154 A FR557154 A FR 557154A
Authority
FR
France
Prior art keywords
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
Thomas Henry Marten
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 FR557154A publication Critical patent/FR557154A/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
    • G03B23/00—Devices for changing pictures in viewing apparatus or projectors
    • G03B23/18—Devices for changing pictures in viewing apparatus or projectors with fade-in and fade-out effects

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
FR557154D 1922-10-07 1922-10-07 Improvements to projection devices Expired FR557154A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR557154T 1922-10-07

Publications (1)

Publication Number Publication Date
FR557154A true FR557154A (en) 1923-08-04

Family

ID=8940666

Family Applications (1)

Application Number Title Priority Date Filing Date
FR557154D Expired FR557154A (en) 1922-10-07 1922-10-07 Improvements to projection devices

Country Status (1)

Country Link
FR (1) FR557154A (en)

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