FR49158E - Improvements to telephone systems - Google Patents

Improvements to telephone systems

Info

Publication number
FR49158E
FR49158E FR49158DA FR49158E FR 49158 E FR49158 E FR 49158E FR 49158D A FR49158D A FR 49158DA FR 49158 E FR49158 E FR 49158E
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.)
Compagnie des Telephones Thomson Houston
Original Assignee
Compagnie des Telephones Thomson Houston
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 Compagnie des Telephones Thomson Houston filed Critical Compagnie des Telephones Thomson Houston
Application granted granted Critical
Publication of FR49158E publication Critical patent/FR49158E/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching
    • H04M9/002—Arrangements for interconnection not involving centralised switching with subscriber controlled access to a line, i.e. key telephone systems
    • H04M9/005—Arrangements for interconnection not involving centralised switching with subscriber controlled access to a line, i.e. key telephone systems with subscriber controlled access to an exchange line

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
FR49158D 1937-07-05 1937-07-05 Improvements to telephone systems Expired FR49158E (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR49158T 1937-07-05

Publications (1)

Publication Number Publication Date
FR49158E true FR49158E (en) 1938-11-28

Family

ID=8684371

Family Applications (2)

Application Number Title Priority Date Filing Date
FR833176D Expired FR833176A (en) 1937-07-05 1937-06-02 Improvements to telephone systems
FR49158D Expired FR49158E (en) 1937-07-05 1937-07-05 Improvements to telephone systems

Family Applications Before (1)

Application Number Title Priority Date Filing Date
FR833176D Expired FR833176A (en) 1937-07-05 1937-06-02 Improvements to telephone systems

Country Status (1)

Country Link
FR (2) FR833176A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2418985A1 (en) * 1978-03-02 1979-09-28 Imberteche Rene Electromechanical telephone network control - has two pairs of relays each having double electromagnets forming switching units

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2679401B1 (en) * 1991-07-16 1993-11-05 Paul Bloch RESIDENTIAL INTERCOMMUNICATION SYSTEM.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2418985A1 (en) * 1978-03-02 1979-09-28 Imberteche Rene Electromechanical telephone network control - has two pairs of relays each having double electromagnets forming switching units

Also Published As

Publication number Publication date
FR833176A (en) 1938-10-13

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