The HP 8410A is an early network analyzer from the late 60s and is one of several components of a system used to measure parameters of RF networks. The 8410A serves as the core processing and measurement unit of the system and includes a swappable CRT-based display module (8412A currently installed). The most interesting part of this particular unit are the two GE Aerospace / Apollo Systems Department asset tags located on the top of the 8412A phase-magnitude display.