FR721100A - projection screen - Google Patents

projection screen

Info

Publication number
FR721100A
FR721100A FR721100DA FR721100A FR 721100 A FR721100 A FR 721100A FR 721100D A FR721100D A FR 721100DA FR 721100 A FR721100 A FR 721100A
Authority
FR
France
Prior art keywords
projection screen
projection
screen
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.)
ED LIESEGANG
Liesegang Ed
Original Assignee
ED LIESEGANG
Liesegang Ed
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 ED LIESEGANG, Liesegang Ed filed Critical ED LIESEGANG
Application granted granted Critical
Publication of FR721100A publication Critical patent/FR721100A/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
    • G03B21/54—Accessories
    • G03B21/56—Projection screens
    • G03B21/58—Projection screens collapsible, e.g. foldable; of variable area

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
FR721100D 1930-08-22 1931-08-06 projection screen Expired FR721100A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE721100X 1930-08-22

Publications (1)

Publication Number Publication Date
FR721100A true FR721100A (en) 1932-02-27

Family

ID=6629154

Family Applications (1)

Application Number Title Priority Date Filing Date
FR721100D Expired FR721100A (en) 1930-08-22 1931-08-06 projection screen

Country Status (1)

Country Link
FR (1) FR721100A (en)

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