Note 5 — Contributions from The Museum of History and Technology: Paper 37 Screw-Thread Cutting by the Master-Screw Method Since 1480
Reading edition
U.S. patent 293930 issued to Charles Vander Woerd of Waltham, Massachusetts, February 19, 1884.
Reading edition
U.S. patent 293930 issued to Charles Vander Woerd of Waltham, Massachusetts, February 19, 1884.