For what purpose are the quick return mechanisms used?

1.	For what purpose are the quick return mechanisms used?
A.	To convert reciprocating motion into oscillatory motion
B.	To convert oscillatory motion into reciprocating motion
C.	To convert reciprocating motion into rotary motion
D.	To convert rotary motion into reciprocating motion
Answer» E.

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For what purpose are the quick return mechanisms used?

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