work, hereby publish it under the following license: English Screw Head. Self-centering Slot author name string: Andrew Pertsev Wikimedia username: Andrew...
work, hereby publish it under the following license: English Screw Head. Unequal Depths Slot (Patents: CH696938A5;CN101605634A;CN101605634B) German Schlitz...
DescriptionScrew Head - Slotted.svg Diagram of a ⊖ screw head - Slotted Date 14 July 2009 Source Own work Author Inductiveload Permission (Reusing this...
