JPH02116593U - - Google Patents

Info

Publication number
JPH02116593U
JPH02116593U JP2387289U JP2387289U JPH02116593U JP H02116593 U JPH02116593 U JP H02116593U JP 2387289 U JP2387289 U JP 2387289U JP 2387289 U JP2387289 U JP 2387289U JP H02116593 U JPH02116593 U JP H02116593U
Authority
JP
Japan
Prior art keywords
tip
propulsion
magnetic field
drilling
tube
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.)
Pending
Application number
JP2387289U
Other languages
English (en)
Japanese (ja)
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 filed Critical
Priority to JP2387289U priority Critical patent/JPH02116593U/ja
Publication of JPH02116593U publication Critical patent/JPH02116593U/ja
Pending legal-status Critical Current

Links

Landscapes

  • Excavating Of Shafts Or Tunnels (AREA)
JP2387289U 1989-03-03 1989-03-03 Pending JPH02116593U (en])

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2387289U JPH02116593U (en]) 1989-03-03 1989-03-03

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2387289U JPH02116593U (en]) 1989-03-03 1989-03-03

Publications (1)

Publication Number Publication Date
JPH02116593U true JPH02116593U (en]) 1990-09-18

Family

ID=31243234

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2387289U Pending JPH02116593U (en]) 1989-03-03 1989-03-03

Country Status (1)

Country Link
JP (1) JPH02116593U (en])

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