Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number P37 REV C found under Resistor Variable W by Sigma Instruments Inc. The National Stock Number assigned to this part is 5905006870482, and the Federal Supply Class is 5905 Resistors. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like P37 REV C.