FR938801A - Improvements to telephone devices - Google Patents

Improvements to telephone devices

Info

Publication number
FR938801A
FR938801A FR938801DA FR938801A FR 938801 A FR938801 A FR 938801A FR 938801D A FR938801D A FR 938801DA FR 938801 A FR938801 A FR 938801A
Authority
FR
France
Prior art keywords
telephone devices
telephone
devices
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.)
Automatic Electric Laboratories Inc
Original Assignee
Automatic 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 Automatic Electric Laboratories Inc filed Critical Automatic Electric Laboratories Inc
Application granted granted Critical
Publication of FR938801A publication Critical patent/FR938801A/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

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
FR938801D 1940-06-08 1946-11-18 Improvements to telephone devices Expired FR938801A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US938801XA 1940-06-08 1940-06-08

Publications (1)

Publication Number Publication Date
FR938801A true FR938801A (en) 1948-10-26

Family

ID=22241486

Family Applications (1)

Application Number Title Priority Date Filing Date
FR938801D Expired FR938801A (en) 1940-06-08 1946-11-18 Improvements to telephone devices

Country Status (1)

Country Link
FR (1) FR938801A (en)

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