GB363453A - Improvements in telephone calling arrangements, particularly for use in police alarmsystems - Google Patents

Improvements in telephone calling arrangements, particularly for use in police alarmsystems

Info

Publication number
GB363453A
GB363453A GB3135030A GB3135030A GB363453A GB 363453 A GB363453 A GB 363453A GB 3135030 A GB3135030 A GB 3135030A GB 3135030 A GB3135030 A GB 3135030A GB 363453 A GB363453 A GB 363453A
Authority
GB
United Kingdom
Prior art keywords
police
alarmsystems
leicester
telephone calling
relay
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
GB3135030A
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
Priority to GB3135030A priority Critical patent/GB363453A/en
Publication of GB363453A publication Critical patent/GB363453A/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

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Alarm Systems (AREA)

Abstract

363,453. Electric signalling systems. PARSONS, I. H., The Croft, Kibworth Harcourt, near Leicester, and WADDING- TON, H. R., 10, Evington Drive, Leicester. Oct. 20, 1930, No. 31350. [Class 40 (i).] A polarized relay C<2> controlling a visual calling signal L at e.g. a police-alarm box is operated over a telephone line by unidirectional pulsating current produced by a magneto M in series with a rectifier D and placed on the line in either direction by a two-way reversing switch N. A high-resistance leak J prevents the discharge of the bell condenser from actuating the relay C<2>.
GB3135030A 1930-10-20 1930-10-20 Improvements in telephone calling arrangements, particularly for use in police alarmsystems Expired GB363453A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3135030A GB363453A (en) 1930-10-20 1930-10-20 Improvements in telephone calling arrangements, particularly for use in police alarmsystems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3135030A GB363453A (en) 1930-10-20 1930-10-20 Improvements in telephone calling arrangements, particularly for use in police alarmsystems

Publications (1)

Publication Number Publication Date
GB363453A true GB363453A (en) 1931-12-24

Family

ID=10321806

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3135030A Expired GB363453A (en) 1930-10-20 1930-10-20 Improvements in telephone calling arrangements, particularly for use in police alarmsystems

Country Status (1)

Country Link
GB (1) GB363453A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD902062S1 (en) 2018-11-13 2020-11-17 Gregg Dickman Emergency notification device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD902062S1 (en) 2018-11-13 2020-11-17 Gregg Dickman Emergency notification device

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