Henry Green applied for a Patent on a Coin-operated Public X-ray Vending Machine

Green used x-rays in an attempt to find a bullet in Theodore Studley’s leg on July 17, 1896.

1. Hartford Hospital will buy an x-ray device from Green & Bauer on November 3, 1896.
2. Green received his patent, No. 607,233, on July 12, 1898.

This was not the only coin-operated public x-ray vending machine proposed.  Jeff Steck chronicled several more that followed Green's invention on the Gazette Cetera blog, and he noted that the last patent application he found was dated 1901.  (Unfortunately, his post is no longer available online.)

“This invention relates to X-ray apparatuses, one object of the invention being to furnish a portable and efficient X-ray apparatus of compact and simplified construction and organization especially adapted to be used by the public without requiring the services of an attendant to operate the same, and which apparatus embodies, in connection with the fluorescing lamp and the electrical circuit in which said lamp is located, coin-operable mechanism for automatically controlling the circuit, whereby the apparatus is rendered operative for a predetermined length of time.”

Steck, Jeff, "X-Ray Vending Machines," Gazette Cetera, February 8, 2012.  Unfortunately, this blog appears to have gone dark since I first found it.

United States Patent Office, "X-Ray Apparatus," Patent No. 607,233, July 12, 1898.