FR704017A - Improvements to telephone systems or similar transmission systems - Google Patents

Improvements to telephone systems or similar transmission systems

Info

Publication number
FR704017A
FR704017A FR704017DA FR704017A FR 704017 A FR704017 A FR 704017A FR 704017D A FR704017D A FR 704017DA FR 704017 A FR704017 A FR 704017A
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 FR704017A publication Critical patent/FR704017A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/20—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Interface Circuits In Exchanges (AREA)
FR704017D 1929-09-10 1930-09-09 Improvements to telephone systems or similar transmission systems Expired FR704017A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US391598A US1837316A (en) 1929-09-10 1929-09-10 Voice operated control arrangement for telephone cable systems

Publications (1)

Publication Number Publication Date
FR704017A true FR704017A (en) 1931-05-09

Family

ID=23547239

Family Applications (1)

Application Number Title Priority Date Filing Date
FR704017D Expired FR704017A (en) 1929-09-10 1930-09-09 Improvements to telephone systems or similar transmission systems

Country Status (4)

Country Link
US (1) US1837316A (en)
DE (1) DE593726C (en)
FR (1) FR704017A (en)
GB (2) GB362858A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE866053C (en) * 1936-10-15 1953-02-05 Siemens Ag Circuit arrangement for loudspeaker systems
GB2137055B (en) * 1983-03-12 1986-11-12 Marconi Avionics Voice communication system

Also Published As

Publication number Publication date
US1837316A (en) 1931-12-22
GB362858A (en) 1931-12-08
GB387391A (en) 1933-02-06
DE593726C (en) 1934-03-08

Similar Documents

Publication Publication Date Title
FR671055A (en) Improvements to telephone systems
FR721123A (en) Improvements to telephone systems
FR693964A (en) Improvements to Combined Electric Transmission Systems
FR704017A (en) Improvements to telephone systems or similar transmission systems
FR682174A (en) Improvements to electrical transmission systems
FR698983A (en) Improvements to electrical transmission systems
FR698488A (en) Improvements to automatic or semi-automatic telephone systems
FR711122A (en) Improvements to automatic or semi-automatic telephone systems
FR37802E (en) Improvements to telephone systems
FR696558A (en) Improvements to telephone systems
FR701306A (en) Improvements to television systems
FR630110A (en) Improvements to telephone systems
FR694716A (en) Improvements to telephone systems
FR684370A (en) Improvements to telephone or similar systems
FR684571A (en) Improvements to transmission systems
FR728614A (en) Improvements to telephone transmission systems
FR671317A (en) Improvements to telephone systems
FR703958A (en) Improvements to telephone systems
FR714245A (en) Improvements to telephone systems
FR723779A (en) Improvements to transmission systems
FR683505A (en) Improvements to electrical transmission systems
FR642998A (en) Improvements to radiotelegraph communications systems
FR693974A (en) Improvements to automatic or semi-automatic telephone systems
FR705947A (en) Improvements to radiotelephone or radiotelegraph communication systems
FR629974A (en) Improvements to telephone systems