4. Mining or in situ disintegration of hard material
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Hurd Robert L.

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Huron Manufacturing Corporation

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Huss Horst

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Hutchins Ned M.

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Hutzell Clyde G.

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Hy-Mac Limited

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Hydra Mining Tools International LTD

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Hydro Extraction Inc.

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Hydro-Ergon Corporation

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Hydrofoam Mining, Inc.

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Hydronautics, Inc.

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