174. How should you signal the crane operator to use the main hoist?

First tap your elbow with one hand, and then proceed to use regular signals.
Extend arm with the thumb pointing up and flex the fingers in and out for as long as the load movement is desired.
First tap the top of your head with your fist, and then proceed to use regular signals.
Use one hand to give any motion signal, and place the other hand motionless in front of the hand giving the motion signal.

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