Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 75D-1 found under Test Set Range Indicator Interro by Aeroflex Wichita Inc. The National Stock Number assigned to this part is 6625011079383, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 75D-1.