FR677988A - Signaling installation comprising annunciators and call devices for crews in the same loop and resonance relays on call devices - Google Patents

Signaling installation comprising annunciators and call devices for crews in the same loop and resonance relays on call devices

Info

Publication number
FR677988A
FR677988A FR677988DA FR677988A FR 677988 A FR677988 A FR 677988A FR 677988D A FR677988D A FR 677988DA FR 677988 A FR677988 A FR 677988A
Authority
FR
France
Prior art keywords
call devices
annunciators
crews
same loop
signaling installation
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)
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.)
Siemens and Halske AG
Siemens AG
Original Assignee
Siemens and Halske AG
Siemens 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 Siemens and Halske AG, Siemens AG filed Critical Siemens and Halske AG
Application granted granted Critical
Publication of FR677988A publication Critical patent/FR677988A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
    • G08B25/01—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium
    • G08B25/04—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium using a single signalling line, e.g. in a closed loop
    • G08B25/045—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium using a single signalling line, e.g. in a closed loop with sensing devices and central station in a closed loop, e.g. McCullough loop

Landscapes

  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
FR677988D 1928-07-27 1929-07-08 Signaling installation comprising annunciators and call devices for crews in the same loop and resonance relays on call devices Expired FR677988A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE677988X 1928-07-27

Publications (1)

Publication Number Publication Date
FR677988A true FR677988A (en) 1930-03-17

Family

ID=6594226

Family Applications (1)

Application Number Title Priority Date Filing Date
FR677988D Expired FR677988A (en) 1928-07-27 1929-07-08 Signaling installation comprising annunciators and call devices for crews in the same loop and resonance relays on call devices

Country Status (1)

Country Link
FR (1) FR677988A (en)

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