JPS5377409A - Communication method in tunnel and underground - Google Patents

Communication method in tunnel and underground

Info

Publication number
JPS5377409A
JPS5377409A JP15289476A JP15289476A JPS5377409A JP S5377409 A JPS5377409 A JP S5377409A JP 15289476 A JP15289476 A JP 15289476A JP 15289476 A JP15289476 A JP 15289476A JP S5377409 A JPS5377409 A JP S5377409A
Authority
JP
Japan
Prior art keywords
tunnel
underground
communication method
communicate
make
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.)
Granted
Application number
JP15289476A
Other languages
English (en)
Other versions
JPS5645540B2 (ja
Inventor
Jiro Chiba
Tatsuo Inaba
Yoshitomo Kuwamoto
Osamu Sakano
Risaburo Sato
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.)
Hitachi Denshi KK
Hitachi Ltd
Yagi Antenna Co Ltd
Original Assignee
Hitachi Denshi KK
Hitachi Ltd
Yagi Antenna 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 Hitachi Denshi KK, Hitachi Ltd, Yagi Antenna Co Ltd filed Critical Hitachi Denshi KK
Priority to JP15289476A priority Critical patent/JPS5377409A/ja
Publication of JPS5377409A publication Critical patent/JPS5377409A/ja
Publication of JPS5645540B2 publication Critical patent/JPS5645540B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Waveguides (AREA)
  • Near-Field Transmission Systems (AREA)
  • Mobile Radio Communication Systems (AREA)
JP15289476A 1976-12-21 1976-12-21 Communication method in tunnel and underground Granted JPS5377409A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15289476A JPS5377409A (en) 1976-12-21 1976-12-21 Communication method in tunnel and underground

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15289476A JPS5377409A (en) 1976-12-21 1976-12-21 Communication method in tunnel and underground

Publications (2)

Publication Number Publication Date
JPS5377409A true JPS5377409A (en) 1978-07-08
JPS5645540B2 JPS5645540B2 (ja) 1981-10-27

Family

ID=15550444

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15289476A Granted JPS5377409A (en) 1976-12-21 1976-12-21 Communication method in tunnel and underground

Country Status (1)

Country Link
JP (1) JPS5377409A (ja)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4020332Y1 (ja) * 1964-11-09 1965-07-15
JPS5042664U (ja) * 1973-08-17 1975-04-30

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4020332Y1 (ja) * 1964-11-09 1965-07-15
JPS5042664U (ja) * 1973-08-17 1975-04-30

Also Published As

Publication number Publication date
JPS5645540B2 (ja) 1981-10-27

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