FR837884A - Improvements to power supply arrangements for telephone systems - Google Patents

Improvements to power supply arrangements for telephone systems

Info

Publication number
FR837884A
FR837884A FR837884DA FR837884A FR 837884 A FR837884 A FR 837884A FR 837884D A FR837884D A FR 837884DA FR 837884 A FR837884 A FR 837884A
Authority
FR
France
Prior art keywords
power supply
telephone systems
supply arrangements
arrangements
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.)
Associated Electric Laboratories Inc
Original Assignee
Associated Electric Laboratories 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 Associated Electric Laboratories Inc filed Critical Associated Electric Laboratories Inc
Application granted granted Critical
Publication of FR837884A publication Critical patent/FR837884A/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
    • H04Q1/38—Signalling arrangements; Manipulation of signalling currents using combinations of direct currents of different amplitudes or polarities over line conductors or combination of line conductors

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
FR837884D 1937-05-20 1938-05-12 Improvements to power supply arrangements for telephone systems Expired FR837884A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB837884X 1937-05-20

Publications (1)

Publication Number Publication Date
FR837884A true FR837884A (en) 1939-02-22

Family

ID=10554324

Family Applications (1)

Application Number Title Priority Date Filing Date
FR837884D Expired FR837884A (en) 1937-05-20 1938-05-12 Improvements to power supply arrangements for telephone systems

Country Status (1)

Country Link
FR (1) FR837884A (en)

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