FR951757A - Telephone system - Google Patents

Telephone system

Info

Publication number: FR951757A
Authority: FR; France
Prior art keywords: telephone system; telephone
Prior art date: 1940-09-20
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

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.)

1940-09-20

Filing date

1947-08-07

Publication date

1949-11-03

1947-08-07 Application filed by Western Electric Co Inc filed Critical Western Electric Co Inc

1949-11-03 Application granted granted Critical

1949-11-03 Publication of FR951757A publication Critical patent/FR951757A/en

Status Expired legal-status Critical Current

Classifications

- 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
- H04M3/64—Arrangements for signalling the number or class of the calling line to the operator

Landscapes

Engineering & Computer Science (AREA)
Signal Processing (AREA)

FR951757D 1940-09-20 1947-08-07 Telephone system Expired FR951757A (en)

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
US951757XA	1940-09-20	1940-09-20

Publications (1)

Publication Number	Publication Date
FR951757A true FR951757A (en)	1949-11-03

Family

ID=22250456

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
FR951757D Expired FR951757A (en)	1940-09-20	1947-08-07	Telephone system

Country Status (1)

Country	Link
FR (1)	FR951757A (en)

1947
- 1947-08-07 FR FR951757D patent/FR951757A/en not_active Expired

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