31756.git, branch main Screw-Thread Cutting by the Master-Screw Method since 1480 initial commit of ebook 31756 2025-10-15T02:56:21+00:00 Roger Frank rfrank@pglaf.org 2025-10-15T02:56:21+00:00 27d7c5ec2e6f2d5afa5ee56261bc0d2c4b2eaaa9