Core-Drill.
Description:
Patent for a core drill for making bore holes in rocks to get out solid samples of the inside of rocks, which has an improved grabbing method for retrieving the piece of rock inside the hole.
Date:
August 3, 1909
Creator:
McLoughlin, Malacha J. & Wynn, John S.
Item Type:
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Patent
Partner:
UNT Libraries Government Documents Department