Title:
【考案の名称】掘削装置
Document Type and Number:
Japanese Patent JP2603214
Kind Code:
Y2
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Inventors:
Masato Ohori
Application Number:
JP9733091U
Publication Date:
March 06, 2000
Filing Date:
October 29, 1991
Export Citation:
Assignee:
Ohori Co., Ltd.
International Classes:
E21B7/00; E21B15/00; (IPC1-7): E21B7/00
Domestic Patent References:
| JP296084A | ||||
| JP250487U |