It was hard to find a site that had a display of old and historical dental chairs. Most sites had maybe 1 or 2 photographs of dental chairs. This is the best site that I've seen regarding the history of the dental chair. There good pictures of old dental chairs and other notes. The dental history here is from Ritter Dental Company that was founded by Frank Ritter who was a cabinet maker from Germany who came to NY on August 1870. The link below starts with his life and his dental chair achievements.
The images above are the first 1888 Stuck Chair which was the first chair that had a disc base unlike the other chairs of those days which had four legs. The ad is for a Model F X-Ray from the 1950's.
Ritter Dental History
November 3, 2009