Boring-Bit.
Description:
Patent for a boring drill. The invention creates a new means "for connecting the constituent members of the head so as to provide novel means for assembling the head with a driving element" (lines 19-22).
Date:
June 10, 1913
Creator:
Larnce, John B.; Townsend, S. L. & Keith, Aubrey R.
Item Type:
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