JPS57146893A - Drilling of bore with enlarged bottom - Google Patents

Drilling of bore with enlarged bottom

Info

Publication number
JPS57146893A
JPS57146893A JP3004981A JP3004981A JPS57146893A JP S57146893 A JPS57146893 A JP S57146893A JP 3004981 A JP3004981 A JP 3004981A JP 3004981 A JP3004981 A JP 3004981A JP S57146893 A JPS57146893 A JP S57146893A
Authority
JP
Japan
Prior art keywords
drilling
bore
enlarged bottom
enlarged
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
JP3004981A
Other languages
English (en)
Japanese (ja)
Other versions
JPS6234914B2 (cs
Inventor
Tsuneo Takagi
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.)
OKADA SAKUGANKI KK
Original Assignee
OKADA SAKUGANKI KK
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 OKADA SAKUGANKI KK filed Critical OKADA SAKUGANKI KK
Priority to JP3004981A priority Critical patent/JPS57146893A/ja
Publication of JPS57146893A publication Critical patent/JPS57146893A/ja
Publication of JPS6234914B2 publication Critical patent/JPS6234914B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Drilling And Exploitation, And Mining Machines And Methods (AREA)
  • Earth Drilling (AREA)
JP3004981A 1981-03-02 1981-03-02 Drilling of bore with enlarged bottom Granted JPS57146893A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3004981A JPS57146893A (en) 1981-03-02 1981-03-02 Drilling of bore with enlarged bottom

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3004981A JPS57146893A (en) 1981-03-02 1981-03-02 Drilling of bore with enlarged bottom

Publications (2)

Publication Number Publication Date
JPS57146893A true JPS57146893A (en) 1982-09-10
JPS6234914B2 JPS6234914B2 (cs) 1987-07-29

Family

ID=12292961

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3004981A Granted JPS57146893A (en) 1981-03-02 1981-03-02 Drilling of bore with enlarged bottom

Country Status (1)

Country Link
JP (1) JPS57146893A (cs)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5578793A (en) * 1978-12-05 1980-06-13 Ishikawajima Harima Heavy Ind Vertical excavator

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5578793A (en) * 1978-12-05 1980-06-13 Ishikawajima Harima Heavy Ind Vertical excavator

Also Published As

Publication number Publication date
JPS6234914B2 (cs) 1987-07-29

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