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FR724426A - Improvements to telephone systems and similar transmission systems - Google Patents

Improvements to telephone systems and similar transmission systems

Info

Publication number
FR724426A
FR724426A FR724426DA FR724426A FR 724426 A FR724426 A FR 724426A FR 724426D A FR724426D A FR 724426DA FR 724426 A FR724426 A FR 724426A
Authority
FR
France
Prior art keywords
systems
similar transmission
telephone
transmission 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.)
Electrical Research Products Inc
Original Assignee
Electrical Research Products 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 Electrical Research Products Inc filed Critical Electrical Research Products Inc
Application granted granted Critical
Publication of FR724426A publication Critical patent/FR724426A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/04—Control of transmission; Equalising
    • H04B3/06—Control of transmission; Equalising by the transmitted signal

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Amplifiers (AREA)
FR724426D 1930-10-08 1931-10-08 Improvements to telephone systems and similar transmission systems Expired FR724426A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US487209A US1844423A (en) 1930-10-08 1930-10-08 Attenuation and volume control

Publications (1)

Publication Number Publication Date
FR724426A true FR724426A (en) 1932-04-27

Family

ID=23934819

Family Applications (1)

Application Number Title Priority Date Filing Date
FR724426D Expired FR724426A (en) 1930-10-08 1931-10-08 Improvements to telephone systems and similar transmission systems

Country Status (3)

Country Link
US (1) US1844423A (en)
FR (1) FR724426A (en)
GB (1) GB390812A (en)

Also Published As

Publication number Publication date
US1844423A (en) 1932-02-09
GB390812A (en) 1933-04-10

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