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Digital lien service
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Patent number 8,234,211
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Issue date Jul 31, 2012
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Copper Range, Inc.
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Randall L. Ray
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G06 - COMPUTING CALCULATING COUNTING
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Roof bolter and process
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Patent number 4,398,850
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Issue date Aug 16, 1983
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Copper Range Company
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Robert D. Talvensaari
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E21 - EARTH DRILLING MINING
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Drive chuck
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Patent number 4,101,141
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Issue date Jul 18, 1978
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Copper Range Company
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Eugene W. Mattila
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B25 - HAND TOOLS PORTABLE POWER-DRIVEN TOOLS MANIPULATORS
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