JPS56156386A - Bit for vertical hole excavation - Google Patents

Bit for vertical hole excavation

Info

Publication number
JPS56156386A
JPS56156386A JP5775580A JP5775580A JPS56156386A JP S56156386 A JPS56156386 A JP S56156386A JP 5775580 A JP5775580 A JP 5775580A JP 5775580 A JP5775580 A JP 5775580A JP S56156386 A JPS56156386 A JP S56156386A
Authority
JP
Japan
Prior art keywords
bit
vertical hole
hole excavation
excavation
vertical
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
JP5775580A
Other languages
Japanese (ja)
Other versions
JPS6356397B2 (en
Inventor
Shiyuuichi Ajiro
Yasuaki Ishikawa
Masami Wada
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 Construction Machinery Co Ltd
Original Assignee
Hitachi Construction Machinery 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 Construction Machinery Co Ltd filed Critical Hitachi Construction Machinery Co Ltd
Priority to JP5775580A priority Critical patent/JPS56156386A/en
Publication of JPS56156386A publication Critical patent/JPS56156386A/en
Publication of JPS6356397B2 publication Critical patent/JPS6356397B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Earth Drilling (AREA)
JP5775580A 1980-05-02 1980-05-02 Bit for vertical hole excavation Granted JPS56156386A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5775580A JPS56156386A (en) 1980-05-02 1980-05-02 Bit for vertical hole excavation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5775580A JPS56156386A (en) 1980-05-02 1980-05-02 Bit for vertical hole excavation

Publications (2)

Publication Number Publication Date
JPS56156386A true JPS56156386A (en) 1981-12-03
JPS6356397B2 JPS6356397B2 (en) 1988-11-08

Family

ID=13064690

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5775580A Granted JPS56156386A (en) 1980-05-02 1980-05-02 Bit for vertical hole excavation

Country Status (1)

Country Link
JP (1) JPS56156386A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5013847U (en) * 1973-06-05 1975-02-13
JPS54130705U (en) * 1978-03-03 1979-09-11

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5013847U (en) * 1973-06-05 1975-02-13
JPS54130705U (en) * 1978-03-03 1979-09-11

Also Published As

Publication number Publication date
JPS6356397B2 (en) 1988-11-08

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