FR997369A - Improvements to projection devices - Google Patents

Improvements to projection devices

Info

Publication number
FR997369A
FR997369A FR997369DA FR997369A FR 997369 A FR997369 A FR 997369A FR 997369D A FR997369D A FR 997369DA FR 997369 A FR997369 A FR 997369A
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
Louis-Jean Damblanc
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 FR997369A publication Critical patent/FR997369A/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)
FR997369D 1945-07-20 1945-07-20 Improvements to projection devices Expired FR997369A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR997369T 1945-07-20

Publications (1)

Publication Number Publication Date
FR997369A true FR997369A (en) 1952-01-04

Family

ID=9558591

Family Applications (1)

Application Number Title Priority Date Filing Date
FR997369D Expired FR997369A (en) 1945-07-20 1945-07-20 Improvements to projection devices

Country Status (1)

Country Link
FR (1) FR997369A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE944402C (en) * 1952-05-06 1956-06-14 Robert Ernest Cherouvrier Apparatus for reading and copying microfilms and similar documents

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE944402C (en) * 1952-05-06 1956-06-14 Robert Ernest Cherouvrier Apparatus for reading and copying microfilms and similar documents

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