Title:
掘削システムおよび掘削方法
Document Type and Number:
Japanese Patent JP6546245
Kind Code:
B2
Inventors:
Shinichi Kida
Application Number:
JP2017207749A
Publication Date:
July 17, 2019
Filing Date:
October 27, 2017
Export Citation:
Assignee:
Kida Shiki Kogyo Co., Ltd.
International Classes:
E21B6/00
Domestic Patent References:
| JP2011220015A | ||||
| JP1122357A | ||||
| JP200732251A |
Attorney, Agent or Firm:
Seiryu International Patent Service Corporation
Takayoshi in the daytime
Masao Sakaizawa
Takayoshi in the daytime
Masao Sakaizawa