Abstract: An installation for assembly-line manufacture in which workpieces move in a row along a production path at a generally uniform spacing. A feed unit holds a supply of workpieces and places them one at a time in a predetermined position in the seats of an input rotary feed conveyor. An inspecting unit defines a portion of the continuous production path for the workpieces and inspects the workpieces as they pass therealong. The inspecting unit itself includes an intake rotary conveyor cooperating with the feed conveyor, an output rotary conveyor, and at least one inspecting carousel between the intake and output conveyors. A controller supervises and coordinates the operation of the other units on the workpieces as same move along the production path.