GB354858A - Improvements in or relating to telephone systems - Google Patents

Improvements in or relating to telephone systems

Info

Publication number
GB354858A
GB354858A GB15549/30A GB1554930A GB354858A GB 354858 A GB354858 A GB 354858A GB 15549/30 A GB15549/30 A GB 15549/30A GB 1554930 A GB1554930 A GB 1554930A GB 354858 A GB354858 A GB 354858A
Authority
GB
United Kingdom
Prior art keywords
relay
switch
zone
zrs
line
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
GB15549/30A
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 GB354858A publication Critical patent/GB354858A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C1/00—Refining of pig-iron; Cast iron
    • C21C1/06—Constructional features of mixers for pig-iron
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M15/00—Arrangements for metering, time-control or time indication ; Metering, charging or billing arrangements for voice wireline or wireless communications, e.g. VoIP
    • H04M15/10—Metering calls from calling party, i.e. A-party charged for the communication

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Signal Processing (AREA)
  • Relay Circuits (AREA)
  • Meter Arrangements (AREA)
GB15549/30A 1929-06-03 1930-05-20 Improvements in or relating to telephone systems Expired GB354858A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US367996A US1810330A (en) 1929-06-03 1929-06-03 Zone metering system

Publications (1)

Publication Number Publication Date
GB354858A true GB354858A (en) 1931-08-20

Family

ID=23449451

Family Applications (1)

Application Number Title Priority Date Filing Date
GB15549/30A Expired GB354858A (en) 1929-06-03 1930-05-20 Improvements in or relating to telephone systems

Country Status (4)

Country Link
US (1) US1810330A (enrdf_load_stackoverflow)
BE (1) BE370794A (enrdf_load_stackoverflow)
FR (1) FR696558A (enrdf_load_stackoverflow)
GB (1) GB354858A (enrdf_load_stackoverflow)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2603712A (en) * 1940-08-26 1952-07-15 Automatic Elect Lab Party line identification in automatic telephony
US2763724A (en) * 1946-10-11 1956-09-18 Automatic Elect Lab Telephone systems
US2682576A (en) * 1951-01-20 1954-06-29 Irving H Selden Telephone system

Also Published As

Publication number Publication date
BE370794A (enrdf_load_stackoverflow)
US1810330A (en) 1931-06-16
FR696558A (fr) 1931-01-05

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