Fenwal Electronics bead thermistor was purchased for use in the Telstar 401 Satellite built by Lockheed Martin for AT&T and launched by NASA on Dec 16, 1993. This 50K ohm bead thermistor part# 503QET-D03 has long 32 gauge tinned copper leads. This thermistor is in a sealed Fenwal factory bag with a 1991 date code. Lockheed Telstar tag not included. Note: Telstar 401was launched by NASA on 16 Dec, 1993 and was rendered inoperable on 11 Jan, 1997 by a magnetic storm on 6 Jan, 1997. Own a piece of history with this thermistor! Retails for $17