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