FR857679A - Improvements to electrical alarm devices - Google Patents

Improvements to electrical alarm devices

Info

Publication number
FR857679A
FR857679A FR857679DA FR857679A FR 857679 A FR857679 A FR 857679A FR 857679D A FR857679D A FR 857679DA FR 857679 A FR857679 A FR 857679A
Authority
FR
France
Prior art keywords
alarm devices
electrical alarm
electrical
devices
alarm
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
Carpenter
Eckersley
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 FR857679A publication Critical patent/FR857679A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B27/00—Alarm systems in which the alarm condition is signalled from a central station to a plurality of substations

Landscapes

  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Emergency Alarm Devices (AREA)
FR857679D 1938-07-12 1939-07-11 Improvements to electrical alarm devices Expired FR857679A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2069538A GB516192A (en) 1938-07-12 1938-07-12 Improvements in and relating to electric alarm systems

Publications (1)

Publication Number Publication Date
FR857679A true FR857679A (en) 1940-09-24

Family

ID=10150142

Family Applications (1)

Application Number Title Priority Date Filing Date
FR857679D Expired FR857679A (en) 1938-07-12 1939-07-11 Improvements to electrical alarm devices

Country Status (3)

Country Link
BE (1) BE435409A (en)
FR (1) FR857679A (en)
GB (1) GB516192A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109658671A (en) * 2018-12-13 2019-04-19 中国电子科技集团公司第四十研究所 A kind of medical electrical equipment auditory alarm system and method

Also Published As

Publication number Publication date
BE435409A (en)
GB516192A (en) 1939-12-27

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