Assertion: pinball's game | /r/HasProperty | made before the invention of the em
Facets:
value: flipper
type: TEMPORAL
Source sentences:
text: It is also used for games made before the invention of the EM flipper but after the invention of the passive bumper (in 1936, see Pacent's 'Bolo' ) because playfields in this time frame (1936-1947) can often look similar to flippered playfields simply because they have these round bumpers , so we identify them as flipperless to clarify this fact for those users who may not be familiar with when the flipper was invented.