Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 433-9063 PARTS KIT-B1 found under Parts Kit Defibrill by Medical Research Laboratories Inc. The National Stock Number assigned to this part is 6545012939701, 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 433-9063 PARTS KIT-B1.