FR712869A - Improvements to projection devices for advertising or other uses - Google Patents

Improvements to projection devices for advertising or other uses

Info

Publication number
FR712869A
FR712869A FR712869DA FR712869A FR 712869 A FR712869 A FR 712869A FR 712869D A FR712869D A FR 712869DA FR 712869 A FR712869 A FR 712869A
Authority
FR
France
Prior art keywords
advertising
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)
Inventor
Camille Contal
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
Application granted granted Critical
Publication of FR712869A publication Critical patent/FR712869A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B23/00—Arrangements producing acoustic signals at preselected times
    • G04B23/02—Alarm clocks
    • G04B23/06—Alarm clocks adjustable for several preselected times with automatic stopping of the signal

Landscapes

  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • General Physics & Mathematics (AREA)
FR712869D 1931-03-04 1931-03-04 Improvements to projection devices for advertising or other uses Expired FR712869A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR712869T 1931-03-04

Publications (1)

Publication Number Publication Date
FR712869A true FR712869A (en) 1931-10-14

Family

ID=9081504

Family Applications (1)

Application Number Title Priority Date Filing Date
FR712869D Expired FR712869A (en) 1931-03-04 1931-03-04 Improvements to projection devices for advertising or other uses

Country Status (1)

Country Link
FR (1) FR712869A (en)

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