Patent record · Mining / Coal
Improvement in Coal-Drills
US200936A
What the patent describes
A toothed, threaded tapering cylinder anchors in coal and supports and guides a screw-fed drill advanced by an adjustable crank and hinged nut.
Why it belongs in the workshop
This entry connects the inventor, date, location, and technical subject so the invention can be explored alongside Shamokin’s wider industrial history.