GB529644A - Improvements in or relating to telephone systems - Google Patents

Improvements in or relating to telephone systems

Info

Publication number
GB529644A
GB529644A GB15248/39A GB1524839A GB529644A GB 529644 A GB529644 A GB 529644A GB 15248/39 A GB15248/39 A GB 15248/39A GB 1524839 A GB1524839 A GB 1524839A GB 529644 A GB529644 A GB 529644A
Authority
GB
United Kingdom
Prior art keywords
line
test
relay
over
operate
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
GB15248/39A
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.)
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
Priority to BE440078D priority Critical patent/BE440078A/xx
Application filed by Individual filed Critical Individual
Priority to GB15248/39A priority patent/GB529644A/en
Priority to US329404A priority patent/US2282900A/en
Publication of GB529644A publication Critical patent/GB529644A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/22—Arrangements for supervision, monitoring or testing
    • H04M3/26—Arrangements for supervision, monitoring or testing with means for applying test signals or for measuring
    • H04M3/28—Automatic routine testing ; Fault testing; Installation testing; Test methods, test equipment or test arrangements therefor
    • H04M3/30—Automatic routine testing ; Fault testing; Installation testing; Test methods, test equipment or test arrangements therefor for subscriber's lines, for the local loop

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
GB15248/39A 1939-05-22 1939-05-22 Improvements in or relating to telephone systems Expired GB529644A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
BE440078D BE440078A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1939-05-22
GB15248/39A GB529644A (en) 1939-05-22 1939-05-22 Improvements in or relating to telephone systems
US329404A US2282900A (en) 1939-05-22 1940-04-13 Telephone system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB15248/39A GB529644A (en) 1939-05-22 1939-05-22 Improvements in or relating to telephone systems

Publications (1)

Publication Number Publication Date
GB529644A true GB529644A (en) 1940-11-26

Family

ID=10055691

Family Applications (1)

Application Number Title Priority Date Filing Date
GB15248/39A Expired GB529644A (en) 1939-05-22 1939-05-22 Improvements in or relating to telephone systems

Country Status (3)

Country Link
US (1) US2282900A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
BE (1) BE440078A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
GB (1) GB529644A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3657714A (en) * 1970-06-10 1972-04-18 Electro Devices Inc Ground eliminator system

Also Published As

Publication number Publication date
BE440078A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
US2282900A (en) 1942-05-12

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