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• Vacuum tubes which activate the mechanisms ...

• To actuate, or to cause to move, or to bring into action, or to set in motion ...

• The relay serves to actuate the dial mechanism of the clock.

• The machines in these plants are largely driven by ac motors.

• This initiates the operation of the governor mechanism.

• The motors operate the caterpillar tracks.

• A separate motor powers the hydraulic pumps.

• All American passenger cars are powered with (or propelled by) 6 or 8-cylinder engines.

• When the machine member is set (or put) in motion, ...

• The rocket is propelled in the same way.