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Patent Searching and Data


Title:
ROCK SAMPLING
Document Type and Number:
United States Patent US3606470
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Assignee:
NATIONAL RESEARCH CORP.
Primary Class:
73/864.41
Other Classes:
125/3, 175/58, 175/308, 299/67
International Classes:
B28D1/00; B28D1/00; (IPC1-7): B28D1/18; E21C13/00
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