FR509828A - Automatic advertising block device - Google Patents

Automatic advertising block device

Info

Publication number
FR509828A
FR509828A FR509828A FR509828DA FR509828A FR 509828 A FR509828 A FR 509828A FR 509828 A FR509828 A FR 509828A FR 509828D A FR509828D A FR 509828DA FR 509828 A FR509828 A FR 509828A
Authority
FR
France
Prior art keywords
block device
advertising block
automatic advertising
automatic
block
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
FR509828A
Other languages
French (fr)
Inventor
Fernand Outrey
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Application granted granted Critical
Publication of FR509828A publication Critical patent/FR509828A/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)
FR509828A 1920-02-12 1920-02-12 Automatic advertising block device Expired FR509828A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR509828T 1920-02-12

Publications (1)

Publication Number Publication Date
FR509828A true FR509828A (en) 1920-11-20

Family

ID=8911310

Family Applications (1)

Application Number Title Priority Date Filing Date
FR509828A Expired FR509828A (en) 1920-02-12 1920-02-12 Automatic advertising block device

Country Status (1)

Country Link
FR (1) FR509828A (en)

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