EXCAVATION TYPE SHIELD WITH NO ROTARY CUTTERS
United States Patent 3468133

Inventors:
Matsushita, Kunijiro
Publication Date:
09/23/1969
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Assignee:
KUMAGAI GUMI CO LTD
Primary Class:
405/145
Other Classes:
299/31
International Classes:
E21D9/06; E21D9/08; E01G3/02; E21C29/00
Foreign References:
CH384612A




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