FR863500A - Improvements to telephone systems - Google Patents

Improvements to telephone systems

Info

Publication number
FR863500A
FR863500A FR863500DA FR863500A FR 863500 A FR863500 A FR 863500A FR 863500D A FR863500D A FR 863500DA FR 863500 A FR863500 A FR 863500A
Authority
FR
France
Prior art keywords
telephone systems
telephone
systems
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 FR863500A publication Critical patent/FR863500A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
FR863500D 1939-02-24 1940-02-21 Improvements to telephone systems Expired FR863500A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US863500XA 1939-02-24 1939-02-24

Publications (1)

Publication Number Publication Date
FR863500A true FR863500A (en) 1941-04-02

Family

ID=22198008

Family Applications (1)

Application Number Title Priority Date Filing Date
FR863500D Expired FR863500A (en) 1939-02-24 1940-02-21 Improvements to telephone systems

Country Status (1)

Country Link
FR (1) FR863500A (en)

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