Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 10-4725-X ITEM NO 131 found under Backplane Assembly by L3 Communications Corp. The National Stock Number assigned to this part is 5998016944756, and the Federal Supply Class is 5998 Electrical And Electronic Assemblies Boards Cards And Associated Hardware. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 10-4725-X ITEM NO 131.