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2016
|
Invention
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Expansion bit. [Problem] To provide an expansion bit configured so as to reduce the energy loss o... |
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2008
|
Invention
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Buffer device of excitation device. [PROBLEMS] To fill an air cylinder with air without installin... |
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2007
|
Invention
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Method of excavating for enlarging bottom part and horizontal multi-spindle excavator used theref... |
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2000
|
Invention
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Multiple air hammer apparatus and excavating direction correcting method therefor. Three air hamm... |
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1997
|
Invention
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Extendable bit. Extendable bit teeth are supported by the guide grooves formed on the end face at... |
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1986
|
Invention
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Air pressure impact drilling method and apparatus for same. ABSTRACT OF THE DISCLOSURE An air-p... |
