TUNNELING DEVICE
United States Patent 3459452
US Patent References:
/RE14454.html
- - RE14454
Apparatus for driving and lining tunnels in unstable soil
- - 3350889
Mining apparatus
- - 1645003
Tunneling machine
- - 1800541
Tunneling machine having horizontally and vertically reciprocated rotatable head
- - 3314725
/RE14454.html
- - RE14454
Apparatus for driving and lining tunnels in unstable soil
- - 3350889
Mining apparatus
- - 1645003
Tunneling machine
- - 1800541
Tunneling machine having horizontally and vertically reciprocated rotatable head
- - 3314725
Inventors:
Schnabel Jr., Harry
Publication Date:
08/05/1969
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Export Citation:
Assignee:
Harry Jr., Schnabel
Primary Class:
Other Classes:
175/91, 299/33
International Classes:
E21D9/08; E21D9/06; E21C23/00; E21B3/08; E21C29/02