Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number UM-PATC-19R found under Amplifier Audio Frequency by United Marine Communications Inc. The National Stock Number assigned to this part is 5996013697696, 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 UM-PATC-19R.