Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number A4200M found under Case Electron Tube by L 3 Communications Dynamic. The National Stock Number assigned to this part is 5960015281147, and the Federal Supply Class is 5960 Electron Tubes And Associated Hardware. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like A4200M.