What is "pushers"

Usage examples of "pushers".

Can-D, ship it in the same ships, reach the colonists with the same well-trained, experienced pushers you use, advertise through pros like Allen and Charlotte Faine.

There she hung, magnified in the long lens, spinning with a manic vengeance, with her masts stuck up like spindles and her stationary mast surfaces bristling with knobby bits that were pushers and tenders, and shuttles from the Shepherds and such.