Four toothed-wheel circular steel cutters, or milling tools, patented by John George Bodmer (Patent No. 8070) in 1839. Four toothed-wheel circular cutters 1839
Model of reversing gearing and friction clutches for winding from mines patented by J.G. Bodmer in 1843 Model of Reversing Gearing and Friction Clutches circa 1843
Universal joint for communicating rotary motion between shafts lying in different planes ( J.G. Bodmer) Universal Joint for Communicating Rotary Motion 1841