FR474578A - Improvements to projection devices - Google Patents

Improvements to projection devices

Info

Publication number
FR474578A
FR474578A FR474578DA FR474578A FR 474578 A FR474578 A FR 474578A FR 474578D A FR474578D A FR 474578DA FR 474578 A FR474578 A FR 474578A
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.)
INTERNATIONALE DE LUMIERE FROIDE PRODEDES Ste
Original Assignee
INTERNATIONALE DE LUMIERE FROIDE PRODEDES Ste
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 INTERNATIONALE DE LUMIERE FROIDE PRODEDES Ste filed Critical INTERNATIONALE DE LUMIERE FROIDE PRODEDES Ste
Application granted granted Critical
Publication of FR474578A publication Critical patent/FR474578A/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
    • G03B21/14—Details
    • G03B21/16—Cooling; Preventing overheating

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
FR474578D 1913-12-11 1913-12-11 Improvements to projection devices Expired FR474578A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR474578T 1913-12-11

Publications (1)

Publication Number Publication Date
FR474578A true FR474578A (en) 1915-02-25

Family

ID=1512542

Family Applications (1)

Application Number Title Priority Date Filing Date
FR474578D Expired FR474578A (en) 1913-12-11 1913-12-11 Improvements to projection devices

Country Status (1)

Country Link
FR (1) FR474578A (en)

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