Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 245-5056 PARTS KIT-A found under Parts Kit Stethoscope Ultrasound by Medasonics Inc. The National Stock Number assigned to this part is 6545013122857, 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 245-5056 PARTS KIT-A.