Tunneling machine with shield supported traveling excavator
United States Patent 3404920
US Patent References:
Shoveling, digging, and boring machine
- - 1987982
Power-mucking shield
- - 2111405
Cage and operating mechanism for shaft shovels
- - 2587844
Mine shaft mucking apparatus
- - 2593693
Material moving and placing apparatus
- - 3042234
Shoveling, digging, and boring machine
- - 1987982
Power-mucking shield
- - 2111405
Cage and operating mechanism for shaft shovels
- - 2587844
Mine shaft mucking apparatus
- - 2593693
Material moving and placing apparatus
- - 3042234
Inventors:
Tabor, John R.
Publication Date:
10/08/1968
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Primary Class:
Other Classes:
299/67, 414/688, 405/141, 299/33
International Classes:
E21D9/08; E21D9/06