this work, hereby publish it under the following license: English Screw Head. Hex-Clutch. Patent US54874831A 1931-07-06 author name string: Andrew Pertsev...
this work, hereby publish it under the following license: English Screw. Combo Hex-Clutch author name string: Andrew Pertsev Wikimedia username: Andrew Pertsev...
DescriptionScrew Head - Clutch Type A.svg Diagram of a screw head - Clutch Type A, or "Bow-Tie" Date 14 July 2009 Source Own work Author Inductiveload...
DescriptionScrew Head - Clutch Type G.svg Diagram of a screw head - Clutch Type G, or "Butterfly" Date 14 July 2009 Source Own work Author Inductiveload...
