坑道閉鎖方法及び坑道閉鎖装置 - Shimizu Construction Co., Ltd.

Title:

坑道閉鎖方法及び坑道閉鎖装置

Document Type and Number:

Japanese Patent JP4771174

Kind Code:

B2

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Inventors:

Hiroo Kumasaka

Application Number:

JP2007130212A

Publication Date:

September 14, 2011

Filing Date:

May 16, 2007

Export Citation:

Assignee:

Shimizu Construction Co., Ltd.

International Classes:

E21F15/02

Domestic Patent References:

Attorney, Agent or Firm:

Masatake Shiga
Tadashi Takahashi
Takashi Watanabe
Masakazu Aoyama

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