GB322050A - Improvements in fire alarm systems in conjunction with telephone exchange systems - Google Patents

Improvements in fire alarm systems in conjunction with telephone exchange systems

Info

Publication number
GB322050A
GB322050A GB2987328A GB2987328A GB322050A GB 322050 A GB322050 A GB 322050A GB 2987328 A GB2987328 A GB 2987328A GB 2987328 A GB2987328 A GB 2987328A GB 322050 A GB322050 A GB 322050A
Authority
GB
United Kingdom
Prior art keywords
systems
telephone exchange
conjunction
fire alarm
alarm systems
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
GB2987328A
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.)
Relay Automatic Telephone Company Ltd
Original Assignee
Relay Automatic Telephone Company Ltd
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 Relay Automatic Telephone Company Ltd filed Critical Relay Automatic Telephone Company Ltd
Publication of GB322050A publication Critical patent/GB322050A/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
    • 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)
  • Telephonic Communication Services (AREA)

Abstract

322,050. Relay Automatic Telephone Co., Ltd., and Inman, T. M. Oct. 16, 1928. Addition to 321,303. Drawings to Specification. Fire, police, and like alarm systems.-In an automatic telephone exchange with arrangements for indicating the caller's number when extension is made to a predetermined (e.g. fire) number, as in the parent Specification, the auxiliary apparatus is connected to the circuit used normally for metering purposes. Specification 303,465 is referred to.
GB2987328A 1928-10-16 1928-10-16 Improvements in fire alarm systems in conjunction with telephone exchange systems Expired GB322050A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2987228A GB321303A (en) 1928-10-16 1928-10-16 Improvements in fire alarm systems in conjunction with telephone exchange systems

Publications (1)

Publication Number Publication Date
GB322050A true GB322050A (en) 1929-11-28

Family

ID=10298556

Family Applications (2)

Application Number Title Priority Date Filing Date
GB2987328A Expired GB322050A (en) 1928-10-16 1928-10-16 Improvements in fire alarm systems in conjunction with telephone exchange systems
GB2987228A Expired GB321303A (en) 1928-10-16 1928-10-16 Improvements in fire alarm systems in conjunction with telephone exchange systems

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB2987228A Expired GB321303A (en) 1928-10-16 1928-10-16 Improvements in fire alarm systems in conjunction with telephone exchange systems

Country Status (1)

Country Link
GB (2) GB322050A (en)

Also Published As

Publication number Publication date
GB321303A (en) 1929-11-07

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