GB492161A - Improvements in automatic burglar and fire alarms - Google Patents

Improvements in automatic burglar and fire alarms

Info

Publication number
GB492161A
GB492161A GB4442/37A GB444237A GB492161A GB 492161 A GB492161 A GB 492161A GB 4442/37 A GB4442/37 A GB 4442/37A GB 444237 A GB444237 A GB 444237A GB 492161 A GB492161 A GB 492161A
Authority
GB
United Kingdom
Prior art keywords
tone arm
fire
arm
record
case
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
GB4442/37A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of GB492161A publication Critical patent/GB492161A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
    • H04M11/04—Telephonic communication systems specially adapted for combination with other electrical systems with alarm systems, e.g. fire, police or burglar alarm systems
    • H04M11/045—Telephonic communication systems specially adapted for combination with other electrical systems with alarm systems, e.g. fire, police or burglar alarm systems using recorded signals, e.g. speech

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Electromechanical Clocks (AREA)
  • Fire Alarms (AREA)
GB4442/37A 1937-02-15 1937-02-15 Improvements in automatic burglar and fire alarms Expired GB492161A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB206325X 1937-02-15

Publications (1)

Publication Number Publication Date
GB492161A true GB492161A (en) 1938-09-15

Family

ID=10149136

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4442/37A Expired GB492161A (en) 1937-02-15 1937-02-15 Improvements in automatic burglar and fire alarms

Country Status (6)

Country Link
US (1) US2191971A (en:Method)
BE (1) BE426001A (en:Method)
CH (1) CH206325A (en:Method)
FR (1) FR832629A (en:Method)
GB (1) GB492161A (en:Method)
NL (1) NL61918C (en:Method)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB589160A (en) * 1945-03-15 1947-06-12 Alfred Samuel Horace Picking Improvements in or relating to automatic alarm systems
FR956829A (en:Method) * 1946-09-03 1950-02-08
US2555714A (en) * 1950-01-24 1951-06-05 H S Brimm Alarm system
US2804501A (en) * 1955-09-26 1957-08-27 Boeing Co Voice warning systems

Also Published As

Publication number Publication date
CH206325A (de) 1939-07-31
FR832629A (fr) 1938-09-29
US2191971A (en) 1940-02-27
NL61918C (en:Method)
BE426001A (en:Method)

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