Patent No. 2,134,185 [GAME APPARATUS] filed January 2, 1936. Granted October 25, 1938 to Leslie M. Hansen. This patent states "Another object of this invention is to provide a coin operated game apparatus in which it is possible by the skillful operation of the same, to obtain a free second operation without inserting a coin into the coin slide."
You can interact with the ChatGPT Bot in any Chat Room and there is a dedicated room. The command is /ai followed by a space and then your ? or inquiry.
ie: /ai What is a EM Pinball Machine?