FR518749A - Improvements to electrical signaling systems - Google Patents

Improvements to electrical signaling systems

Info

Publication number
FR518749A
FR518749A FR518749A FR518749DA FR518749A FR 518749 A FR518749 A FR 518749A FR 518749 A FR518749 A FR 518749A FR 518749D A FR518749D A FR 518749DA FR 518749 A FR518749 A FR 518749A
Authority
FR
France
Prior art keywords
signaling systems
electrical signaling
electrical
systems
signaling
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
FR518749A
Other languages
French (fr)
Inventor
Lee De Forest
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Application granted granted Critical
Publication of FR518749A publication Critical patent/FR518749A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B13/00—Transmission systems characterised by the medium used for transmission, not provided for in groups H04B3/00 - H04B11/00
    • H04B13/02—Transmission systems in which the medium consists of the earth or a large mass of water thereon, e.g. earth telegraphy

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
FR518749A 1920-03-13 1920-07-02 Improvements to electrical signaling systems Expired FR518749A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US160430XA 1920-03-13 1920-03-13
FR518749T 1920-07-02

Publications (1)

Publication Number Publication Date
FR518749A true FR518749A (en) 1921-05-30

Family

ID=21775066

Family Applications (1)

Application Number Title Priority Date Filing Date
FR518749A Expired FR518749A (en) 1920-03-13 1920-07-02 Improvements to electrical signaling systems

Country Status (2)

Country Link
FR (1) FR518749A (en)
GB (1) GB160430A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3967201A (en) * 1974-01-25 1976-06-29 Develco, Inc. Wireless subterranean signaling method

Also Published As

Publication number Publication date
GB160430A (en) 1921-08-25

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