Title:
コアドリルのコア体結合構造
Document Type and Number:
Japanese Patent JP3602069
Kind Code:
B2
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Inventors:
Miyanaga Saki
Application Number:
JP2001166768A
Publication Date:
December 15, 2004
Filing Date:
June 01, 2001
Export Citation:
Assignee:
Miyanaga Co., Ltd.
International Classes:
E21B25/10; B23B31/02; B23B31/107; B23B31/113; B23B51/04; B28D1/14; (IPC1-7): B23B51/04; B23B31/113
Domestic Patent References:
| JP4083516U |
Foreign References:
| US3647310 | ||||
| US1645736 | ||||
| WO2001028721A1 | ||||
| WO2001038027A1 |
Attorney, Agent or Firm:
Yoshihiro Tsunoda
Yasu Furukawa
Yasu Furukawa