FR422762A - Perfectionnements aux téléphones - Google Patents

Perfectionnements aux téléphones

Info

Publication number
FR422762A
FR422762A FR422762DA FR422762A FR 422762 A FR422762 A FR 422762A FR 422762D A FR422762D A FR 422762DA FR 422762 A FR422762 A FR 422762A
Authority
FR
France
Prior art keywords
enhancements
phone
phone enhancements
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
English (en)
Inventor
Elhanan Bowman
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Application granted granted Critical
Publication of FR422762A publication Critical patent/FR422762A/fr
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/68—Circuit arrangements for preventing eavesdropping
    • H04M1/70—Lock-out or secrecy arrangements in party-line systems

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
FR422762D 1910-11-18 1910-11-18 Perfectionnements aux téléphones Expired FR422762A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR422762T 1910-11-18

Publications (1)

Publication Number Publication Date
FR422762A true FR422762A (fr) 1911-03-30

Family

ID=1465683

Family Applications (1)

Application Number Title Priority Date Filing Date
FR422762D Expired FR422762A (fr) 1910-11-18 1910-11-18 Perfectionnements aux téléphones

Country Status (1)

Country Link
FR (1) FR422762A (fr)

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