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The internal-drive square socket for screws (as well as the corresponding triangular socket drive) had been conceived several decades before the invention of the Robertson screw and driver. An earlier patent covering both square-socket- and triangle-socket -drive wood screws, U.S. patent 161,390 , was issued to Allan Cummings of New York City ...
The Phillips/square screw drive, also known as the Quadrex, Pozisquare screw drive, is a combination of the Phillips and Robertson screw drives. While a standard Phillips or Robertson tool can be used, there is also a dedicated tool for it that increases the surface area between the tool and the fastener so it can handle more torque.
2 Prison screw. 4 comments. 3 PolyDrive. 1 comment. 4 Spline drive. 1 comment. ... 6 Screw head diagrams. 2 comments. 7 Clutch head bit is not one way. 2 comments. 8 ...
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Information from its description page there is shown below. ... Description=Diagram of a screw head - Pozidrive |Source=Own work by uploader |Date=2009/07/14 ...
English: Diagram of a screw head - External Square Head. Date: 14 July 2009: Source: Own work: Author: ... Description=Diagram of a screw head - External Square Head ...
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Description: Diagram of a screw head - Line female drive. Date: 17 November 2010: Source: Own work based on: Screw Head - Polydrive.svg, Screw Head - Polydrive.svg and 32: Author: Screw Head - Polydrive.svg: Inductiveload / derivative work: Wizard191 ; Other versions: Derivative works of this file: Screw head - line female tamper.svg
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