GB308796A - Improvements in or relating to high frequency telephone systems - Google Patents

Improvements in or relating to high frequency telephone systems

Info

Publication number
GB308796A
GB308796A GB8713/29A GB871329A GB308796A GB 308796 A GB308796 A GB 308796A GB 8713/29 A GB8713/29 A GB 8713/29A GB 871329 A GB871329 A GB 871329A GB 308796 A GB308796 A GB 308796A
Authority
GB
United Kingdom
Prior art keywords
relay
over
exchange
frequency
connector
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
GB8713/29A
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 Telephone and Telegraph Co
Original Assignee
Associated Telephone and Telegraph Co
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 Telephone and Telegraph Co filed Critical Associated Telephone and Telegraph Co
Publication of GB308796A publication Critical patent/GB308796A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M7/00—Arrangements for interconnection between switching centres
    • H04M7/16—Arrangements for interconnection between switching centres in systems employing carrier frequencies

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Telephonic Communication Services (AREA)
GB8713/29A 1928-03-30 1929-03-18 Improvements in or relating to high frequency telephone systems Expired GB308796A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US308796XA 1928-03-30 1928-03-30

Publications (1)

Publication Number Publication Date
GB308796A true GB308796A (en) 1930-06-18

Family

ID=21856487

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8713/29A Expired GB308796A (en) 1928-03-30 1929-03-18 Improvements in or relating to high frequency telephone systems

Country Status (2)

Country Link
FR (1) FR672257A (enrdf_load_stackoverflow)
GB (1) GB308796A (enrdf_load_stackoverflow)

Also Published As

Publication number Publication date
FR672257A (enrdf_load_stackoverflow) 1929-12-31

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