FR54402E - Improvements to projection devices and the like - Google Patents

Improvements to projection devices and the like

Info

Publication number
FR54402E
FR54402E FR54402DA FR54402E FR 54402 E FR54402 E FR 54402E FR 54402D A FR54402D A FR 54402DA FR 54402 E FR54402 E FR 54402E
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)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Compagnie Francaise Thomson Houston SA
Original Assignee
Compagnie Francaise Thomson Houston SA
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 by Compagnie Francaise Thomson Houston SA filed Critical Compagnie Francaise Thomson Houston SA
Application granted granted Critical
Publication of FR54402E publication Critical patent/FR54402E/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)
FR54402D 1942-06-16 1942-06-16 Improvements to projection devices and the like Expired FR54402E (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR54402T 1942-06-16

Publications (1)

Publication Number Publication Date
FR54402E true FR54402E (en) 1950-05-02

Family

ID=8688856

Family Applications (1)

Application Number Title Priority Date Filing Date
FR54402D Expired FR54402E (en) 1942-06-16 1942-06-16 Improvements to projection devices and the like

Country Status (1)

Country Link
FR (1) FR54402E (en)

Cited By (2)

* 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
US3623804A (en) * 1968-10-18 1971-11-30 Francis F Spreitzer Microfilm projector apparatus

Cited By (2)

* 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
US3623804A (en) * 1968-10-18 1971-11-30 Francis F Spreitzer Microfilm projector apparatus

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