FR811689A - trans-sound screen for cinemas - Google Patents

trans-sound screen for cinemas

Info

Publication number
FR811689A
FR811689A FR811689DA FR811689A FR 811689 A FR811689 A FR 811689A FR 811689D A FR811689D A FR 811689DA FR 811689 A FR811689 A FR 811689A
Authority
FR
France
Prior art keywords
cinemas
trans
sound screen
sound
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.)
Valeo SE
Original Assignee
Francaise du Ferodo 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 Francaise du Ferodo SA filed Critical Francaise du Ferodo SA
Application granted granted Critical
Publication of FR811689A publication Critical patent/FR811689A/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
    • G03B21/565—Screens allowing free passage of sound

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
FR811689D 1936-01-03 1936-01-03 trans-sound screen for cinemas Expired FR811689A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR811689T 1936-01-03

Publications (1)

Publication Number Publication Date
FR811689A true FR811689A (en) 1937-04-20

Family

ID=9261922

Family Applications (1)

Application Number Title Priority Date Filing Date
FR811689D Expired FR811689A (en) 1936-01-03 1936-01-03 trans-sound screen for cinemas

Country Status (1)

Country Link
FR (1) FR811689A (en)

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