Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number B73-133504 found under Relay Electromagnet by Joslyn Products. The National Stock Number assigned to this part is 5945003664723, and the Federal Supply Class is 5945 Relays And Solenoids. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like B73-133504.