FR774975A - Appareil amplificateur de sons à relais - Google Patents

Appareil amplificateur de sons à relais

Info

Publication number
FR774975A
FR774975A FR774975DA FR774975A FR 774975 A FR774975 A FR 774975A FR 774975D A FR774975D A FR 774975DA FR 774975 A FR774975 A FR 774975A
Authority
FR
France
Prior art keywords
amplifier device
sound amplifier
relay sound
relay
sound
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.)
COUESNON SA
Original Assignee
COUESNON 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 COUESNON SA filed Critical COUESNON SA
Application granted granted Critical
Publication of FR774975A publication Critical patent/FR774975A/fr
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B7/00—Signalling systems according to more than one of groups G08B3/00 - G08B6/00; Personal calling systems according to more than one of groups G08B3/00 - G08B6/00
    • G08B7/06—Signalling systems according to more than one of groups G08B3/00 - G08B6/00; Personal calling systems according to more than one of groups G08B3/00 - G08B6/00 using electric transmission, e.g. involving audible and visible signalling through the use of sound and light sources

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
FR774975D 1933-09-15 1933-09-15 Appareil amplificateur de sons à relais Expired FR774975A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR774975T 1933-09-15

Publications (1)

Publication Number Publication Date
FR774975A true FR774975A (fr) 1934-12-17

Family

ID=9200187

Family Applications (1)

Application Number Title Priority Date Filing Date
FR774975D Expired FR774975A (fr) 1933-09-15 1933-09-15 Appareil amplificateur de sons à relais

Country Status (1)

Country Link
FR (1) FR774975A (fr)

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