Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 943 434-999 found under Switch Fiber Optic by Hirschmann Corp. The National Stock Number assigned to this part is 6021016208444, and the Federal Supply Class is 6021 Fiber Optic Switches. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 943 434-999.