CH236666A - Telecommunications exchange system. - Google Patents

Telecommunications exchange system.

Info

Publication number
CH236666A
CH236666A CH236666DA CH236666A CH 236666 A CH236666 A CH 236666A CH 236666D A CH236666D A CH 236666DA CH 236666 A CH236666 A CH 236666A
Authority
CH
Switzerland
Prior art keywords
exchange system
telecommunications exchange
telecommunications
exchange
Prior art date
Application number
Other languages
German (de)
Inventor
Bell Telephone Manufac Anonyme
Original Assignee
Bell Telephone Mfg
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 Bell Telephone Mfg filed Critical Bell Telephone Mfg
Publication of CH236666A publication Critical patent/CH236666A/en

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)
  • Monitoring And Testing Of Exchanges (AREA)
CH236666D 1936-05-27 1937-02-19 Telecommunications exchange system. CH236666A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BE236666X 1936-05-27

Publications (1)

Publication Number Publication Date
CH236666A true CH236666A (en) 1945-02-28

Family

ID=3866331

Family Applications (1)

Application Number Title Priority Date Filing Date
CH236666D CH236666A (en) 1936-05-27 1937-02-19 Telecommunications exchange system.

Country Status (5)

Country Link
CH (1) CH236666A (en)
DE (1) DE760243C (en)
FR (1) FR822124A (en)
GB (1) GB490015A (en)
NL (1) NL46909C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1026374B (en) * 1955-08-30 1958-03-20 Siemens Ag Device for simultaneous monitoring for short circuit or earth fault and for wire breakage of a line pair that is used for the transmission of messages, in particular fire messages, and is used for quiescent current monitored line pairs

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1013706B (en) * 1956-01-14 1957-08-14 Telefonbau & Normalzeit Gmbh Circuit arrangement for the transmission of messages over discussed telephone connection lines
DE1086758B (en) * 1957-12-23 1960-08-11 Wilhelm Vershoven Fault reporting device whose monitoring alarms can be connected in parallel to telephone subscriber lines via modulators
CN102944730B (en) * 2012-11-05 2015-06-10 深圳创维－Rgb电子有限公司 Automatic detection device for voltage abnormal state

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE570938C (en) * 1927-12-29 1933-02-21 Siemens & Halske Akt Ges Circuit arrangement for telephone systems with intercom stations which are provided with self-loading devices
DE636313C (en) * 1927-12-30 1936-10-10 Siemens & Halske Akt Ges Circuit arrangement for telephone systems for the transmission of surveillance signals to an officer
CH174234A (en) * 1932-12-23 1934-12-31 Siemens Ag Circuit arrangement for transmitting messages, in particular fire and police messages, to a message receiving center.
CH181393A (en) * 1934-06-23 1935-12-15 Autophon Ag Circuit arrangement for telecommunications systems.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1026374B (en) * 1955-08-30 1958-03-20 Siemens Ag Device for simultaneous monitoring for short circuit or earth fault and for wire breakage of a line pair that is used for the transmission of messages, in particular fire messages, and is used for quiescent current monitored line pairs

Also Published As

Publication number Publication date
FR822124A (en) 1937-12-21
NL46909C (en)
GB490015A (en) 1938-08-05
DE760243C (en) 1953-06-15

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