FR41987E - Improvements made to telephone systems, in particular to those of auxiliary telephone offices linked respectively by a line to a central telephone office - Google Patents

Improvements made to telephone systems, in particular to those of auxiliary telephone offices linked respectively by a line to a central telephone office

Info

Publication number
FR41987E
FR41987E FR41987DA FR41987E FR 41987 E FR41987 E FR 41987E FR 41987D A FR41987D A FR 41987DA FR 41987 E FR41987 E FR 41987E
Authority
FR
France
Prior art keywords
telephone
those
line
improvements made
auxiliary
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)
Inventor
Louis-Lucien-Eugene Chauveau
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 filed Critical
Application granted granted Critical
Publication of FR41987E publication Critical patent/FR41987E/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/60—Semi-automatic systems, i.e. in which the numerical selection of the outgoing line is under the control of an operator
    • H04M3/62—Keyboard equipment
    • 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
    • H04Q3/0008—Selecting arrangements using relay selectors in the switching stages

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
FR41987D 1934-02-23 1932-05-09 Improvements made to telephone systems, in particular to those of auxiliary telephone offices linked respectively by a line to a central telephone office Expired FR41987E (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR44931T 1934-02-23

Publications (1)

Publication Number Publication Date
FR41987E true FR41987E (en) 1933-05-04

Family

ID=8680718

Family Applications (4)

Application Number Title Priority Date Filing Date
FR644822D Expired FR644822A (en) 1934-02-23
FR37804D Expired FR37804E (en) 1934-02-23 1929-12-11 Improvements made to telephone systems, in particular to those of auxiliary telephone offices linked respectively by a line and a central telephone office
FR41987D Expired FR41987E (en) 1934-02-23 1932-05-09 Improvements made to telephone systems, in particular to those of auxiliary telephone offices linked respectively by a line to a central telephone office
FR44931D Expired FR44931E (en) 1934-02-23 1934-02-23 Improvements to telephone systems, in particular to those of auxiliary telephone offices linked respectively by a line to a central telephone office

Family Applications Before (2)

Application Number Title Priority Date Filing Date
FR644822D Expired FR644822A (en) 1934-02-23
FR37804D Expired FR37804E (en) 1934-02-23 1929-12-11 Improvements made to telephone systems, in particular to those of auxiliary telephone offices linked respectively by a line and a central telephone office

Family Applications After (1)

Application Number Title Priority Date Filing Date
FR44931D Expired FR44931E (en) 1934-02-23 1934-02-23 Improvements to telephone systems, in particular to those of auxiliary telephone offices linked respectively by a line to a central telephone office

Country Status (1)

Country Link
FR (4) FR37804E (en)

Also Published As

Publication number Publication date
FR644822A (en) 1928-10-15
FR37804E (en) 1931-01-24
FR44931E (en) 1935-05-01

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