FR872188A - Improvements to telephone systems - Google Patents

Improvements to telephone systems

Info

Publication number
FR872188A
FR872188A FR872188DA FR872188A FR 872188 A FR872188 A FR 872188A FR 872188D A FR872188D A FR 872188DA FR 872188 A FR872188 A FR 872188A
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.)
Automatic Telephone and Electric Co Ltd
Original Assignee
Automatic Telephone and Electric Co Ltd
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 Telephone and Electric Co Ltd filed Critical Automatic Telephone and Electric Co Ltd
Application granted granted Critical
Publication of FR872188A publication Critical patent/FR872188A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M15/00—Arrangements for metering, time-control or time indication ; Metering, charging or billing arrangements for voice wireline or wireless communications, e.g. VoIP
    • H04M15/04—Recording calls, or communications in printed, perforated or other permanent form

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)
FR872188D 1939-05-05 1940-05-01 Improvements to telephone systems Expired FR872188A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1353839A GB528971A (en) 1939-05-05 1939-05-05 Improvements in or relating to telephone systems

Publications (1)

Publication Number Publication Date
FR872188A true FR872188A (en) 1942-06-01

Family

ID=10024788

Family Applications (1)

Application Number Title Priority Date Filing Date
FR872188D Expired FR872188A (en) 1939-05-05 1940-05-01 Improvements to telephone systems

Country Status (3)

Country Link
ES (1) ES149488A1 (en)
FR (1) FR872188A (en)
GB (1) GB528971A (en)

Also Published As

Publication number Publication date
ES149488A1 (en) 1943-06-01
GB528971A (en) 1940-11-12

Similar Documents

Publication Publication Date Title
FR865522A (en) Improvements to telephone systems
FR856153A (en) Improvements to telephone systems
FR933317A (en) Improvements to radio-telegraph systems
FR831620A (en) Improvements to telephone systems
FR951758A (en) Improvements to telephone systems
FR863581A (en) Improvements to television systems
FR50457E (en) Improvements to telephone systems
FR932189A (en) Improvements to telephone systems
FR864516A (en) Loudspeaker Systems Improvements
FR840325A (en) Improvements to telephone systems
FR933150A (en) Improvements to television systems
FR931904A (en) Improvements to telephone systems
FR833176A (en) Improvements to telephone systems
FR864510A (en) Improvements to modulator systems
FR931429A (en) Improvements to radio-telegraph systems
FR863500A (en) Improvements to telephone systems
FR50504E (en) Improvements to telephone systems
FR861824A (en) Improvements to telephone systems
FR860144A (en) Improvements to telephone systems
FR872188A (en) Improvements to telephone systems
FR853385A (en) Improvements to telephone systems
FR847279A (en) Improvements to telephone systems
FR838511A (en) Improvements to telephone systems
FR937959A (en) Improvements to telephone systems
FR868709A (en) Improvements to telecommunication systems