Assertion: coin's denomination | /r/HasProperty | needed into mechanism
Facets:
value: by the 1950s
type: TEMPORAL
Source sentences:
text: Among the innovations in business caused by the use of the nickel in coin-operated machines was the automat, in which patrons would serve themselves by inserting a coin (initially a nickel, though by the 1950s a higher denomination was needed) into a mechanism, turning a handle, and removing a sandwich or dessert.