JPS6239856B2 - - Google Patents

Info

Publication number
JPS6239856B2
JPS6239856B2 JP10222580A JP10222580A JPS6239856B2 JP S6239856 B2 JPS6239856 B2 JP S6239856B2 JP 10222580 A JP10222580 A JP 10222580A JP 10222580 A JP10222580 A JP 10222580A JP S6239856 B2 JPS6239856 B2 JP S6239856B2
Authority
JP
Japan
Prior art keywords
points
coated metal
metal conduit
ground electrode
coated
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
JP10222580A
Other languages
English (en)
Japanese (ja)
Other versions
JPS5726942A (en
Inventor
Masayuki Matsura
Kimimasa Saito
Yoshihiro Yamamoto
Yasuharu Hosohara
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.)
Tokyo Gas Co Ltd
Original Assignee
Tokyo Gas 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 Tokyo Gas Co Ltd filed Critical Tokyo Gas Co Ltd
Priority to JP10222580A priority Critical patent/JPS5726942A/ja
Publication of JPS5726942A publication Critical patent/JPS5726942A/ja
Publication of JPS6239856B2 publication Critical patent/JPS6239856B2/ja
Granted 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)
  • Near-Field Transmission Systems (AREA)
  • Prevention Of Electric Corrosion (AREA)
  • Pipeline Systems (AREA)
JP10222580A 1980-07-25 1980-07-25 Data transmission system Granted JPS5726942A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10222580A JPS5726942A (en) 1980-07-25 1980-07-25 Data transmission system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10222580A JPS5726942A (en) 1980-07-25 1980-07-25 Data transmission system

Publications (2)

Publication Number Publication Date
JPS5726942A JPS5726942A (en) 1982-02-13
JPS6239856B2 true JPS6239856B2 (enrdf_load_stackoverflow) 1987-08-25

Family

ID=14321708

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10222580A Granted JPS5726942A (en) 1980-07-25 1980-07-25 Data transmission system

Country Status (1)

Country Link
JP (1) JPS5726942A (enrdf_load_stackoverflow)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI77131C (fi) * 1987-01-22 1989-01-10 Outokumpu Oy Anordning foer aostadkommande av dubbelriktad kommunikation i underjordiska utrymmen.
JP2550982Y2 (ja) * 1988-03-11 1997-10-15 文化シヤッター 株式会社 障害物検出装置
GB9212685D0 (en) * 1992-06-15 1992-07-29 Flight Refueling Ltd Data transfer
FR2745133B1 (fr) * 1996-02-20 1998-05-07 Vernet Jean Marc Procede et dispositif de telemesure sur ouvrage metallique protege par soutirage
GB0100107D0 (en) * 2001-01-03 2001-02-14 Flight Refueling Ltd Data transmission in pipeline systems
FR2858495B1 (fr) * 2003-07-29 2005-10-14 Jean Marc Vernet Procede et dispositif autonome de transmission de signaux electriques sur support conducteur quelconque

Also Published As

Publication number Publication date
JPS5726942A (en) 1982-02-13

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