Title:
TUNNEL DRIVING MACHINE HAVING SYMMETRICAL BRACES
United States Patent 3498675

Inventors:
Kampf-emden, Gerd
Staymann, Wilhelm
Publication Date:
03/03/1970
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Assignee:
DEMAG AG
Primary Class:
299/31
Other Classes:
299/75
International Classes:
E21C27/22; E21D9/10; E21D9/12; E21C27/00; E21C1/00; E21C19/00; E21C9/00
Foreign References:
GB997519A




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