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The person-on-board system allows for storage of items in loss than unit load quantities. A person rides
on m platform with the S/R machine to pick up individual items from a bin or
drawer. This provides an in-aisle order-picking ability that can reduce the
time it takes to fill an order. The operator can select the items and place
them into a tote or module, which is then carried by the S/R machine to the end of the aisle or to a conveyor
to reach its destination. The platform (the operator is on) may contain
additional devices, some automatic, to facilitate lifting of heavy items.
(John G. Webster,Wiley encyclopedia of electrical and electronics engineering, 23. cilt,John Wiley, 1999,page443)
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