I'm on a NIM (Nuclear Instrumentation Module) binge!
Just received these; a dual logic pulse counter, and RS232 computer interface for it, and a single channel pulse height analyser (window discriminator).
I must admit, I have the same admiration for these modules that people has for aerospace/space electronics and parts. These modules are produced in fairly low volume, and
identical units has been used in most if not all famous high energy physics experiments since the mid-60's, from reactor monitoring to particle accelerators, diffraction studies, cosmic ray observatories, and so on.
I'm hoping to get some modules some day with 'famous' lab inventory labels, like Oak Ridge NL, Los Alamos, CERN, etc.