… a double or triple seam). Electric sewing machines with a built‑in electric motor, whether domestic or otherwise, … to the sewing machines called “overlock” or “serger” with built-in electric motor of an output not exceeding 120 …
… , i.e., a system of vertical tubing connected to conduits in which the feed water circulates, and designed to … by a valve and coupled to the steam or compressed air conduit. In other cases soot removers take the form of …
