Patents
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E21 - Earth or rock drilling; Mining
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E21F - Safety devices, transport, filling-up, rescue, ventilation, or drainage in or of mines or tunnels
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E21F 13 - Transport specially adapted to underground conditions
Patents for E21F 13 - Transport specially adapted to underground conditions (2,802)
02/1976
02/10/1976
USRE28707
Multi-purpose vehicle for use underground
01/1976
01/13/1976
US3931999
Apparatus for hydraulically transporting solids
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