This small CRT mounted (a temperary service install) reminds me of s small hole of a company called Matrix Instruments I worked for back in 1979 (just out of college) that made machines that would take video and project it onto Xray film to create hard copy in the form doctors were used to working with back then. Except we used solid state Conrac black and white monitors like their model "QQA" and replaced the big CRT they came with with small flat screen 5 inch CRTs. This would then be installed inside a black metal cabinet with the CRT facing up, aimed at a camera lens with shutter that was part of an Xray camera system. Stupid little product, but thet sold a bunch.