"Games for the Severely Disabled”. A project documented by Saleem J. Sheredos, at the Veterans Administration Prosthetics Center, Bioengineering Research Centre, New York (Spring 1973)
Sip-Puff first seen with the POSM makes a game of Pinball possible to play with a puff of air. Was used alongside the earliest modified games console.
As a side note, many young children and novice pinball players use both flipper buttons at exactly the same time, making the game one-button in effect.