FR951758A - Improvements to telephone systems - Google Patents

Improvements to telephone systems

Info

Publication number
FR951758A
FR951758A FR951758DA FR951758A FR 951758 A FR951758 A FR 951758A FR 951758D A FR951758D A FR 951758DA FR 951758 A FR951758 A FR 951758A
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.)
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 FR951758A publication Critical patent/FR951758A/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)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)
FR951758D 1938-12-01 1947-08-07 Improvements to telephone systems Expired FR951758A (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
FR951758A true FR951758A (en) 1949-11-03

Family

ID=22918388

Family Applications (2)

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

Family Applications After (1)

Application Number Title Priority Date Filing Date
FR1031552D Expired FR1031552A (en) 1938-12-01 1947-08-07 Telephony system

Country Status (6)

Country Link
US (3) US2208765A (en)
BE (1) BE476596A (en)
CH (2) CH286287A (en)
FR (2) FR951758A (en)
GB (2) GB640033A (en)
NL (2) NL70515C (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
US2208765A (en) 1940-07-23
CH286287A (en) 1952-10-15
NL70515C (en)
NL72721C (en)
FR1031552A (en) 1953-06-24
BE476596A (en)
GB640032A (en) 1950-07-12
USRE22440E (en) 1944-02-22
GB640033A (en) 1950-07-12
USRE22441E (en) 1944-02-22
CH276283A (en) 1951-06-30

Similar Documents

Publication Publication Date Title
FR865522A (en) Improvements to telephone systems
FR856153A (en) Improvements to telephone systems
FR861968A (en) Improvements to television systems
FR50613E (en) Improvements to television systems
FR933317A (en) Improvements to radio-telegraph systems
FR831620A (en) Improvements to telephone systems
FR951758A (en) Improvements to telephone systems
FR858896A (en) Improvements to electro-magnetic systems
FR854039A (en) Improvements to telephone systems
FR847613A (en) Stylograph refinements
FR932189A (en) Improvements to telephone systems
FR851173A (en) Improvements to modulation systems
FR840325A (en) Improvements to telephone systems
FR853385A (en) Improvements to telephone systems
FR49158E (en) Improvements to telephone systems
FR841582A (en) Improvements to telephone systems
FR842110A (en) Improvements to telephone systems
FR931904A (en) Improvements to telephone systems
FR847279A (en) Improvements to telephone systems
FR838511A (en) Improvements to telephone systems
FR850177A (en) Improvements to telecommunications systems
FR937959A (en) Improvements to telephone systems
FR931429A (en) Improvements to radio-telegraph systems
FR852985A (en) Improvements to automatic telephone systems
FR861824A (en) Improvements to telephone systems