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Henry Aylmer
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Mechanical Pencils And Projecting And Retracting Systems Therefor, And Multi-System Writing Instruments
(AREA)
Abstract
24,652. Aylmer, H. Nov. 22. Rock drills.- Renewable bits B for band or machine drills are attached to the shank A by a dovetail or like connection, and are kept central by a pin C.
GB189824652D1898-11-221898-11-22Improvements in Miners' Drills.
ExpiredGB189824652A
(en)
Improvements in Frames for Supporting Rock Drills Used in Shaft Sinking, and for Serving, when Transformed, as a Scaffold for Use when Lining the Shaft.