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US1693040A
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Mining system and apparatus
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US1646417A
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Coal-mine roof-supporting mechanism and means for operating the same
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Lubricating mechanism for sprocket chains
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Method and apparatus for mining coal
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Mining machine
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US1674870A
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Tunneling machine
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US1642885A
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Mining apparatus
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|
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Mining machine
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US1578544A
|
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Mining machine
|
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US1711280A
|
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Long-wall mining and loading machine
|
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US1649911A
|
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Drilling apparatus
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US1490399A
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System of mining
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US1706962A
|
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Mining machine
|
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US1675723A
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Mining and loading machine
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US1710887A
|
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Mining machine
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US1710486A
|
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Coal-mining apparatus
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US1594373A
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Electric locomotive
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US1693344A
|
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Loading and conveying apparatus for coal mines
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Long-wall mining and loading machine
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US1693343A
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Mining and loading machine and method
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