FR856679A - Electrical communications system - Google Patents

Electrical communications system

Info

Publication number
FR856679A
FR856679A FR856679DA FR856679A FR 856679 A FR856679 A FR 856679A FR 856679D A FR856679D A FR 856679DA FR 856679 A FR856679 A FR 856679A
Authority
FR
France
Prior art keywords
communications system
electrical communications
electrical
communications
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.)
Thales SA
Original Assignee
Le Materiel Telephonique Thomson CSF
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 Le Materiel Telephonique Thomson CSF filed Critical Le Materiel Telephonique Thomson CSF
Application granted granted Critical
Publication of FR856679A publication Critical patent/FR856679A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/40—Monitoring; Testing of relay systems
    • H04B17/401—Monitoring; Testing of relay systems with selective localization
    • H04B17/402—Monitoring; Testing of relay systems with selective localization using different frequencies
    • H04B17/404—Monitoring; Testing of relay systems with selective localization using different frequencies selected by local filters

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
FR856679D 1938-06-21 1939-06-20 Electrical communications system Expired FR856679A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB856679X 1938-06-21

Publications (1)

Publication Number Publication Date
FR856679A true FR856679A (en) 1940-08-01

Family

ID=10590604

Family Applications (1)

Application Number Title Priority Date Filing Date
FR856679D Expired FR856679A (en) 1938-06-21 1939-06-20 Electrical communications system

Country Status (1)

Country Link
FR (1) FR856679A (en)

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