FR1031552A - Telephony system - Google Patents

Telephony system

Info

Publication number
FR1031552A
FR1031552A FR1031552DA FR1031552A FR 1031552 A FR1031552 A FR 1031552A FR 1031552D A FR1031552D A FR 1031552DA FR 1031552 A FR1031552 A FR 1031552A
Authority
FR
France
Prior art keywords
telephony system
telephony
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.)
AT&T Corp
Original Assignee
Western Electric Co 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 Western Electric Co Inc filed Critical Western Electric Co Inc
Application granted granted Critical
Publication of FR1031552A publication Critical patent/FR1031552A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/40—Applications of speech amplifiers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/60—Semi-automatic systems, i.e. in which the numerical selection of the outgoing line is under the control of an operator
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/42—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)
FR1031552D 1938-12-01 1947-08-07 Telephony system Expired FR1031552A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US243347A US2208765A (en) 1938-12-01 1938-12-01 Telephone system

Publications (1)

Publication Number Publication Date
FR1031552A true FR1031552A (en) 1953-06-24

Family

ID=22918388

Family Applications (2)

Application Number Title Priority Date Filing Date
FR1031552D Expired FR1031552A (en) 1938-12-01 1947-08-07 Telephony system
FR951758D Expired FR951758A (en) 1938-12-01 1947-08-07 Improvements to telephone systems

Family Applications After (1)

Application Number Title Priority Date Filing Date
FR951758D Expired FR951758A (en) 1938-12-01 1947-08-07 Improvements to telephone systems

Country Status (6)

Country Link
US (3) US2208765A (en)
BE (1) BE476596A (en)
CH (2) CH286287A (en)
FR (2) FR1031552A (en)
GB (2) GB640032A (en)
NL (2) NL72721C (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2586901A (en) * 1948-07-24 1952-02-26 Bell Telephone Labor Inc Two-way trunk circuit arranged for dial-back operations
US2691068A (en) * 1950-12-11 1954-10-05 Stromberg Carlson Co Two-way carrier type trunk circuit
US2715158A (en) * 1951-10-31 1955-08-09 Stromberg Carlson Co Signaling system
US2708692A (en) * 1952-06-14 1955-05-17 Automatic Elect Lab Toll switching telephone systems
US2726285A (en) * 1952-09-06 1955-12-06 Gen Dynamics Corp Dial cord circuit
US2769862A (en) * 1953-02-06 1956-11-06 Gen Dynamics Corp Convertible interoffice trunk

Also Published As

Publication number Publication date
CH286287A (en) 1952-10-15
CH276283A (en) 1951-06-30
NL72721C (en)
NL70515C (en)
US2208765A (en) 1940-07-23
FR951758A (en) 1949-11-03
USRE22441E (en) 1944-02-22
GB640033A (en) 1950-07-12
GB640032A (en) 1950-07-12
USRE22440E (en) 1944-02-22
BE476596A (en)

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