FR462550A - Further development of electrical alarm signals - Google Patents

Further development of electrical alarm signals

Info

Publication number
FR462550A
FR462550A FR462550DA FR462550A FR 462550 A FR462550 A FR 462550A FR 462550D A FR462550D A FR 462550DA FR 462550 A FR462550 A FR 462550A
Authority
FR
France
Prior art keywords
further development
alarm signals
electrical alarm
electrical
signals
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
Ernest Edward Rogers
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.)
FOSTER ENGINEERING C Ltd
Original Assignee
FOSTER ENGINEERING C Ltd
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 FOSTER ENGINEERING C Ltd filed Critical FOSTER ENGINEERING C Ltd
Application granted granted Critical
Publication of FR462550A publication Critical patent/FR462550A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B5/00—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied
    • G08B5/22—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied using electric transmission; using electromagnetic transmission
    • G08B5/24—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied using electric transmission; using electromagnetic transmission with indicator element moving about a pivot, e.g. hinged flap or rotating vane
    • G08B5/28—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied using electric transmission; using electromagnetic transmission with indicator element moving about a pivot, e.g. hinged flap or rotating vane with hinged flap or arm

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
FR462550D 1913-09-15 1913-09-15 Further development of electrical alarm signals Expired FR462550A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR462550T 1913-09-15

Publications (1)

Publication Number Publication Date
FR462550A true FR462550A (en) 1914-01-29

Family

ID=1501720

Family Applications (1)

Application Number Title Priority Date Filing Date
FR462550D Expired FR462550A (en) 1913-09-15 1913-09-15 Further development of electrical alarm signals

Country Status (1)

Country Link
FR (1) FR462550A (en)

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