FR715926A - Ouverture variable d'émetteur de son - Google Patents

Ouverture variable d'émetteur de son

Info

Publication number
FR715926A
FR715926A FR715926DA FR715926A FR 715926 A FR715926 A FR 715926A FR 715926D A FR715926D A FR 715926DA FR 715926 A FR715926 A FR 715926A
Authority
FR
France
Prior art keywords
sound emitter
emitter opening
variable sound
variable
opening
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
English (en)
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.)
Julius Pintsch AG
Original Assignee
Julius Pintsch AG
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 Julius Pintsch AG filed Critical Julius Pintsch AG
Application granted granted Critical
Publication of FR715926A publication Critical patent/FR715926A/fr
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B3/00—Audible signalling systems, e.g. audible personal calling systems
    • G08B3/06—Audible signalling systems, e.g. audible personal calling systems using hydraulic transmission; using pneumatic transmission

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
FR715926D 1930-04-25 1931-04-23 Ouverture variable d'émetteur de son Expired FR715926A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE715926X 1930-04-25

Publications (1)

Publication Number Publication Date
FR715926A true FR715926A (fr) 1931-12-11

Family

ID=6626306

Family Applications (1)

Application Number Title Priority Date Filing Date
FR715926D Expired FR715926A (fr) 1930-04-25 1931-04-23 Ouverture variable d'émetteur de son

Country Status (1)

Country Link
FR (1) FR715926A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4027115A (en) * 1972-05-15 1977-05-31 Siemens Aktiengesellschaft Electroacoustic sound generator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4027115A (en) * 1972-05-15 1977-05-31 Siemens Aktiengesellschaft Electroacoustic sound generator

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