CH545981A - - Google Patents

Info

Publication number
CH545981A
CH545981A CH1832972A CH545981DA CH545981A CH 545981 A CH545981 A CH 545981A CH 1832972 A CH1832972 A CH 1832972A CH 545981D A CH545981D A CH 545981DA CH 545981 A CH545981 A CH 545981A
Authority
CH
Switzerland
Prior art keywords
projection screen
base
ball
fastening device
fitting
Prior art date
Application number
CH1832972A
Other languages
German (de)
English (en)
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
Publication of CH545981A publication Critical patent/CH545981A/de

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)
  • Overhead Projectors And Projection Screens (AREA)
CH1832972A 1972-12-15 1972-12-15 CH545981A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1832972 1972-12-15

Publications (1)

Publication Number Publication Date
CH545981A true CH545981A (fr) 1974-02-15

Family

ID=4432190

Family Applications (1)

Application Number Title Priority Date Filing Date
CH1832972A CH545981A (fr) 1972-12-15 1972-12-15

Country Status (1)

Country Link
CH (1) CH545981A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106886257A (zh) * 2017-03-27 2017-06-23 歌尔股份有限公司 一种计算设备

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106886257A (zh) * 2017-03-27 2017-06-23 歌尔股份有限公司 一种计算设备

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Legal Events

Date Code Title Description
PL Patent ceased