control means for supplying to the servomotor, based on the load signal and a control algorithm, a servomotor drive signal specifying servomotor operating parameters, including a rotational direction and a velocity, sufficient to cause {HEAD ~ the servomotor} to impart to {TAIL ~ the load} via the support device a desired elevating velocity within a desired amount of time 
to impart to
control means for supplying to the servomotor , based on the load signal and a control algorithm , a servomotor drive signal specifying servomotor operating parameters , including a rotational direction and a velocity , sufficient to cause { HEAD ~ the servomotor } to impart to { TAIL ~ the load } via the support device a desired elevating velocity within a desired amount of time
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