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Home › Easily-cuttable tunnel segment structure

Easily-cuttable tunnel segment structure

US Patent 7004679 · Granted Feb 28, 2006

Estimated economic value: $139,000 ⓘ

Assignee

Inventors

Ryoichi Naka (4 patents)
Toshihiko Yoshizumi (1 patents)
Shinichi Nakata (1 patents)
Fumio Kondoh (1 patents)
Seiichi Satoh (1 patents)
Osamu Ishita (1 patents)
Yutaka Fujino (1 patents)
Tukasi Chiba (1 patents)

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