Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number R19B found under Resistor Variable Wire Wound Non by Atb Laurence Scott Ltd. The National Stock Number assigned to this part is 5905004831480, 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 R19B.