GB476587A - Improvements in or relating to telephone systems - Google Patents

Improvements in or relating to telephone systems

Info

Publication number
GB476587A
GB476587A GB16345/36A GB1634536A GB476587A GB 476587 A GB476587 A GB 476587A GB 16345/36 A GB16345/36 A GB 16345/36A GB 1634536 A GB1634536 A GB 1634536A GB 476587 A GB476587 A GB 476587A
Authority
GB
United Kingdom
Prior art keywords
relay
busy
test
over
exchange
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
GB16345/36A
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.)
Associated Electric Laboratories Inc
Original Assignee
Associated Electric Laboratories Inc
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 Associated Electric Laboratories Inc filed Critical Associated Electric Laboratories Inc
Publication of GB476587A publication Critical patent/GB476587A/en
Expired legal-status Critical Current

Links

Classifications

    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
GB16345/36A 1935-07-12 1936-06-11 Improvements in or relating to telephone systems Expired GB476587A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US30957A US2091116A (en) 1935-07-12 1935-07-12 Automatic telephone system

Publications (1)

Publication Number Publication Date
GB476587A true GB476587A (en) 1937-12-13

Family

ID=21856901

Family Applications (1)

Application Number Title Priority Date Filing Date
GB16345/36A Expired GB476587A (en) 1935-07-12 1936-06-11 Improvements in or relating to telephone systems

Country Status (3)

Country Link
US (1) US2091116A (enrdf_load_stackoverflow)
BE (1) BE416505A (enrdf_load_stackoverflow)
GB (1) GB476587A (enrdf_load_stackoverflow)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE475627A (enrdf_load_stackoverflow) * 1946-08-24
US2562362A (en) * 1947-11-04 1951-07-31 Automatic Elect Lab Testing system employing test distributor switches and test connector switches
US2623956A (en) * 1949-02-14 1952-12-30 Stromberg Carlson Co Telephone test selector
US2564013A (en) * 1949-06-17 1951-08-14 Stromberg Carlson Co Telephone test selector

Also Published As

Publication number Publication date
BE416505A (enrdf_load_stackoverflow)
US2091116A (en) 1937-08-24

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