JPS51141416A - Straight drilling method and apparatus - Google Patents

Straight drilling method and apparatus

Info

Publication number
JPS51141416A
JPS51141416A JP6620775A JP6620775A JPS51141416A JP S51141416 A JPS51141416 A JP S51141416A JP 6620775 A JP6620775 A JP 6620775A JP 6620775 A JP6620775 A JP 6620775A JP S51141416 A JPS51141416 A JP S51141416A
Authority
JP
Japan
Prior art keywords
drilling method
straight drilling
straight
drilling
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
JP6620775A
Other languages
English (en)
Japanese (ja)
Other versions
JPS5313885B2 (enExample
Inventor
Fukuichi Kukihara
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.)
Tone Boring Co Ltd
Original Assignee
Tone Boring 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 Tone Boring Co Ltd filed Critical Tone Boring Co Ltd
Priority to JP6620775A priority Critical patent/JPS51141416A/ja
Publication of JPS51141416A publication Critical patent/JPS51141416A/ja
Publication of JPS5313885B2 publication Critical patent/JPS5313885B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Excavating Of Shafts Or Tunnels (AREA)
  • Earth Drilling (AREA)
JP6620775A 1975-06-02 1975-06-02 Straight drilling method and apparatus Granted JPS51141416A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6620775A JPS51141416A (en) 1975-06-02 1975-06-02 Straight drilling method and apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6620775A JPS51141416A (en) 1975-06-02 1975-06-02 Straight drilling method and apparatus

Publications (2)

Publication Number Publication Date
JPS51141416A true JPS51141416A (en) 1976-12-06
JPS5313885B2 JPS5313885B2 (enExample) 1978-05-13

Family

ID=13309148

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6620775A Granted JPS51141416A (en) 1975-06-02 1975-06-02 Straight drilling method and apparatus

Country Status (1)

Country Link
JP (1) JPS51141416A (enExample)

Also Published As

Publication number Publication date
JPS5313885B2 (enExample) 1978-05-13

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