Title:
TUNNEL DRIVING SHIELD HAVING PIVOTALLY MOUNTED DRILLING BOOM
United States Patent 3469884
Inventors:
Kampf-emden, Gerhard
Publication Date:
09/30/1969
Export Citation:
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Assignee:
DEMAG AG
Primary Class:
299/33
Other Classes:
299/75
International Classes:
E21D9/10; E21D9/10; (IPC1-7): E21D23/08; E21C25/00
View Patent Images:
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US Patent References:
3350889Apparatus for driving and lining tunnels in unstable soil
3332721Device having adjustable knives for forming tunnels in soil
Foreign References:
FR1268468A
GB987505A




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