GB179930A - Improvements in or relating to telephone systems - Google Patents

Improvements in or relating to telephone systems

Info

Publication number
GB179930A
GB179930A GB12869/22A GB1286922A GB179930A GB 179930 A GB179930 A GB 179930A GB 12869/22 A GB12869/22 A GB 12869/22A GB 1286922 A GB1286922 A GB 1286922A GB 179930 A GB179930 A GB 179930A
Authority
GB
United Kingdom
Prior art keywords
relay
relays
relating
telephone systems
automatic telephone
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
GB12869/22A
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.)
Automatic Telephone Manufacturing Co Ltd
Original Assignee
Automatic Telephone Manufacturing Co 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 Automatic Telephone Manufacturing Co Ltd filed Critical Automatic Telephone Manufacturing Co Ltd
Publication of GB179930A publication Critical patent/GB179930A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/0016—Arrangements providing connection between exchanges

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Telephone Set Structure (AREA)
  • Magnetic Treatment Devices (AREA)
  • Percussion Or Vibration Massage (AREA)
  • Interface Circuits In Exchanges (AREA)
GB12869/22A 1921-05-14 1922-05-06 Improvements in or relating to telephone systems Expired GB179930A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US469414A US1674652A (en) 1921-05-14 1921-05-14 Automatic telephone system

Publications (1)

Publication Number Publication Date
GB179930A true GB179930A (en) 1923-08-07

Family

ID=23863694

Family Applications (1)

Application Number Title Priority Date Filing Date
GB12869/22A Expired GB179930A (en) 1921-05-14 1922-05-06 Improvements in or relating to telephone systems

Country Status (3)

Country Link
US (1) US1674652A (forum.php)
FR (1) FR550784A (forum.php)
GB (1) GB179930A (forum.php)

Also Published As

Publication number Publication date
FR550784A (forum.php) 1923-03-20
US1674652A (en) 1928-06-26

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