GB324713A - Burglar or fire alarm installations - Google Patents

Burglar or fire alarm installations

Info

Publication number
GB324713A
GB324713A GB31935/28A GB3193528A GB324713A GB 324713 A GB324713 A GB 324713A GB 31935/28 A GB31935/28 A GB 31935/28A GB 3193528 A GB3193528 A GB 3193528A GB 324713 A GB324713 A GB 324713A
Authority
GB
United Kingdom
Prior art keywords
disc
springs
gramophone
protective circuit
shaft
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
GB31935/28A
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 GB324713A publication Critical patent/GB324713A/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)
  • Alarm Systems (AREA)
  • Burglar Alarm Systems (AREA)
GB31935/28A 1928-01-10 1928-11-02 Burglar or fire alarm installations Expired GB324713A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1796358X 1928-01-10

Publications (1)

Publication Number Publication Date
GB324713A true GB324713A (en) 1930-02-03

Family

ID=7743687

Family Applications (1)

Application Number Title Priority Date Filing Date
GB31935/28A Expired GB324713A (en) 1928-01-10 1928-11-02 Burglar or fire alarm installations

Country Status (4)

Country Link
US (1) US1796358A (en:Method)
BE (1) BE355278A (en:Method)
FR (1) FR664738A (en:Method)
GB (1) GB324713A (en:Method)

Also Published As

Publication number Publication date
BE355278A (en:Method)
US1796358A (en) 1931-03-17
FR664738A (fr) 1929-09-06

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