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FR665579A - Connection arrangement for telephone systems operated by selector switches and speech current amplifiers - Google Patents

Connection arrangement for telephone systems operated by selector switches and speech current amplifiers

Info

Publication number
FR665579A
FR665579A FR665579DA FR665579A FR 665579 A FR665579 A FR 665579A FR 665579D A FR665579D A FR 665579DA FR 665579 A FR665579 A FR 665579A
Authority
FR
France
Prior art keywords
connection arrangement
telephone systems
selector switches
current amplifiers
systems operated
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.)
Siemens and Halske AG
Original Assignee
Siemens and Halske AG
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 Siemens and Halske AG filed Critical Siemens and Halske AG
Application granted granted Critical
Publication of FR665579A publication Critical patent/FR665579A/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

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Interface Circuits In Exchanges (AREA)
FR665579D 1927-12-15 1928-12-12 Connection arrangement for telephone systems operated by selector switches and speech current amplifiers Expired FR665579A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1795494X 1927-12-15

Publications (1)

Publication Number Publication Date
FR665579A true FR665579A (en) 1929-09-20

Family

ID=7743641

Family Applications (1)

Application Number Title Priority Date Filing Date
FR665579D Expired FR665579A (en) 1927-12-15 1928-12-12 Connection arrangement for telephone systems operated by selector switches and speech current amplifiers

Country Status (3)

Country Link
US (1) US1795494A (en)
BE (1) BE356540A (en)
FR (1) FR665579A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2580709A (en) * 1947-11-14 1952-01-01 Automatic Elect Lab Toll switching telephone system having automatic amplifier insertion and gain setting

Also Published As

Publication number Publication date
US1795494A (en) 1931-03-10
BE356540A (en)

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