6685-00-223-6819 (MIL-R-12619)
6685-00-223-6819 is equivalent to manufacture part number 74-21. It is a psychrometer rotor and is classified under Federal Supply Class 6685 (6685 - Pressure, Temperature, and Humidity Instruments), stocked for defense, aerospace, MRO, and industrial maintenance applications. This item is cataloged in the NATO supply system under 6685 - Pressure, Temperature, and Humidity Instruments and is available through NSN-PARTS for U.S. government MRO, and commercial procurement.