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FR719054A - Improvements to telephone installations - Google Patents

Improvements to telephone installations

Info

Publication number
FR719054A
FR719054A FR719054DA FR719054A FR 719054 A FR719054 A FR 719054A FR 719054D A FR719054D A FR 719054DA FR 719054 A FR719054 A FR 719054A
Authority
FR
France
Prior art keywords
telephone installations
installations
telephone
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.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
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 Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Application granted granted Critical
Publication of FR719054A publication Critical patent/FR719054A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details
    • H04Q1/30—Signalling arrangements; Manipulation of signalling currents
    • H04Q1/32—Signalling arrangements; Manipulation of signalling currents using trains of DC pulses

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Interface Circuits In Exchanges (AREA)
FR719054D 1930-08-04 1931-06-23 Improvements to telephone installations Expired FR719054A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE380508X 1930-08-04
SE719054X 1930-08-04

Publications (1)

Publication Number Publication Date
FR719054A true FR719054A (en) 1932-02-01

Family

ID=26656267

Family Applications (1)

Application Number Title Priority Date Filing Date
FR719054D Expired FR719054A (en) 1930-08-04 1931-06-23 Improvements to telephone installations

Country Status (2)

Country Link
FR (1) FR719054A (en)
GB (1) GB380508A (en)

Also Published As

Publication number Publication date
GB380508A (en) 1932-09-19

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