Lincoln Service Parts 1 › Lincoln Electric 9SM18720-52 SEMICONDUCTOR RECTIFIER M18720-52 Lincoln Electric 9SM18720-52 SEMICONDUCTOR RECTIFIER M18720-52 Sale Price: $60.24 Original Price: $69.28 SEMICONDUCTOR RECTIFIER PURCHASE PRICE SHOWN IS FOR A QUANTITY OF 1 Add To Cart Added! SEMICONDUCTOR RECTIFIER PURCHASE PRICE SHOWN IS FOR A QUANTITY OF 1