GB191216084A - Improvements in and relating to Secret Intercommunication Telephone Systems. - Google Patents

Improvements in and relating to Secret Intercommunication Telephone Systems.

Info

Publication number
GB191216084A
GB191216084A GB191216084DA GB191216084A GB 191216084 A GB191216084 A GB 191216084A GB 191216084D A GB191216084D A GB 191216084DA GB 191216084 A GB191216084 A GB 191216084A
Authority
GB
United Kingdom
Prior art keywords
secret
relating
telephone systems
intercommunication telephone
bell
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
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.)
TELEPHONFABRIK ACTIENGESELLSCH
Original Assignee
TELEPHONFABRIK ACTIENGESELLSCH
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 TELEPHONFABRIK ACTIENGESELLSCH filed Critical TELEPHONFABRIK ACTIENGESELLSCH
Application granted granted Critical
Publication of GB191216084A publication Critical patent/GB191216084A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching
    • H04M9/002—Arrangements for interconnection not involving centralised switching with subscriber controlled access to a line, i.e. key telephone systems

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Indicating And Signalling Devices For Elevators (AREA)
  • Alarm Systems (AREA)
GB191216084D 1911-12-22 1912-07-09 Improvements in and relating to Secret Intercommunication Telephone Systems. Expired GB191216084A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE191216084X 1911-12-22

Publications (1)

Publication Number Publication Date
GB191216084A true GB191216084A (en) 1913-02-13

Family

ID=32604356

Family Applications (1)

Application Number Title Priority Date Filing Date
GB191216084D Expired GB191216084A (en) 1911-12-22 1912-07-09 Improvements in and relating to Secret Intercommunication Telephone Systems.

Country Status (2)

Country Link
DE (1) DE266865C (https=)
GB (1) GB191216084A (https=)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1029419B (de) * 1953-12-22 1958-05-08 Hagenuk Neufeldt Kuhnke Gmbh Schaltungsanordnung fuer Fernsprechanlagen mit Gespraechsgeheimhaltung
DE933345C (de) * 1954-03-11 1955-09-22 Funke & Huster Elek Zitaetsges Batterielose Fernsprechanlage fuer Linienwahl

Also Published As

Publication number Publication date
DE266865C (https=)

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