FR696558A - Improvements to telephone systems - Google Patents

Improvements to telephone systems

Info

Publication number
FR696558A
FR696558A FR696558DA FR696558A FR 696558 A FR696558 A FR 696558A FR 696558D A FR696558D A FR 696558DA FR 696558 A FR696558 A FR 696558A
Authority
FR
France
Prior art keywords
telephone systems
telephone
systems
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
Other languages
French (fr)
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
Application granted granted Critical
Publication of FR696558A publication Critical patent/FR696558A/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
FR696558D 1929-06-03 1930-05-30 Improvements to telephone systems Expired FR696558A (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
FR696558A true FR696558A (en) 1931-01-05

Family

ID=23449451

Family Applications (1)

Application Number Title Priority Date Filing Date
FR696558D Expired FR696558A (en) 1929-06-03 1930-05-30 Improvements to telephone systems

Country Status (4)

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

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
US1810330A (en) 1931-06-16
BE370794A (en)
GB354858A (en) 1931-08-20

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