This patent started the era of shape-shifting furniture - This Day in Patent History On August 15, 1848, the first U.S. patent for a dental chair with adjustable elevation and tilt of the seat and back was issued to M.W. Hanchett…
This Day in Patent History - On January 26, 1875, the first electric dental drill was patented George Green, a development that revolutionized dentistry On January 26, 1875, the first electric dental drill was patented George Green, a development that revolutionized dentistry. Humans have been drilling teeth since over…
This Day in Patent History - On November 28, 1916, Edward H Angle invented an Orthodontic appliance to force the teeth of the dental arch into proper alignment On November 28, 1916, Edward H Angle invented an Orthodontic appliance to force the teeth of the dental arch into proper alignment. This patent is…
