FR1013390A - Improvements to projection devices - Google Patents

Improvements to projection devices

Info

Publication number
FR1013390A
FR1013390A FR1013390DA FR1013390A FR 1013390 A FR1013390 A FR 1013390A FR 1013390D A FR1013390D A FR 1013390DA FR 1013390 A FR1013390 A FR 1013390A
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
Alberic Plocq
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 FR1013390A publication Critical patent/FR1013390A/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
    • G03B21/10—Projectors with built-in or built-on screen
    • G03B21/11—Projectors with built-in or built-on screen for microfilm reading

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
FR1013390D 1950-03-01 1950-03-01 Improvements to projection devices Expired FR1013390A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1013390T 1950-03-01

Publications (1)

Publication Number Publication Date
FR1013390A true FR1013390A (en) 1952-07-28

Family

ID=9571617

Family Applications (1)

Application Number Title Priority Date Filing Date
FR1013390D Expired FR1013390A (en) 1950-03-01 1950-03-01 Improvements to projection devices

Country Status (1)

Country Link
FR (1) FR1013390A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1001500B (en) * 1953-04-11 1957-01-24 Ferrania Spa Portable projector
US2847902A (en) * 1954-12-03 1958-08-19 Ferrania Spa Portable projection apparatus for diapositives and microfilms

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1001500B (en) * 1953-04-11 1957-01-24 Ferrania Spa Portable projector
US2847902A (en) * 1954-12-03 1958-08-19 Ferrania Spa Portable projection apparatus for diapositives and microfilms

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