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Title:
BIT FOR EXPANDING HOLE
Document Type and Number:
Japanese Patent JPS54117104
Kind Code:
A
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Inventors:
NAGAYAMA YOSHIHISA
Application Number:
JP2434178A
Publication Date:
September 11, 1979
Filing Date:
March 02, 1978
Export Citation:
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Assignee:
TONE BORING CO
International Classes:
E21B7/20; E21B10/32; (IPC1-7): E02D17/148
Domestic Patent References:
JPS4935172A1974-04-01
JPS50106402A1975-08-21



 
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