work, hereby publish it under the following license: English Screw Head. Cross Slot with Recess author name string: Andrew Pertsev Wikimedia username: Andrew...
hereby publish it under the following license: English Screw Head. Crossed Slot with central recess author name string: Andrew Pertsev Wikimedia username:...
hereby publish it under the following license: English Slotted screw with a central recess. (European patent application. Registration number: 81102529...
