Lincoln K and KP Numbers › Lincoln Electric K2952-3-3-45-550 MAGNUM PRO CURVE 400, 20 FT, 550A EXP. Lincoln Electric K2952-3-3-45-550 MAGNUM PRO CURVE 400, 20 FT, 550A EXP. Sale Price: $846.70 Original Price: $948.30 MAGNUM PRO CURVE 400, 20 FT, 550A EXP. PURCHASE PRICE SHOWN IS FOR A QUANTITY OF 1.000 Add To Cart Added! MAGNUM PRO CURVE 400, 20 FT, 550A EXP. PURCHASE PRICE SHOWN IS FOR A QUANTITY OF 1.000