Title:
【考案の名称】石割用掘削機
Document Type and Number:
Japanese Patent JP2579730
Kind Code:
Y2
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Inventors:
Sumitomo Saito
Application Number:
JP5002991U
Publication Date:
August 27, 1998
Filing Date:
June 28, 1991
Export Citation:
Assignee:
Hirado Metal Industry Co., Ltd.
International Classes:
B25D17/28; E21B7/02; E21B15/00; E21B19/08; E21C37/02; (IPC1-7): E21C37/02; E21C11/00
Domestic Patent References:
| JP60219392A | ||||
| JP5980592U | ||||
| JP5910239Y2 |
Attorney, Agent or Firm:
Kenichiro Matsuo