Before Polaroid camera backs became common in the late 1960's and 1970's, Leicas were often used in laboratories for recording microscope images and oscilloscope traces. The optical equipment was often German then so it was no surprise that a Leica was the camera of choice. The fact that the Leicas were available as a body alone made it simple for the camera to be mated to a microscope. I encountered Leicas in several laboratories being used for this purpose, even with Zeiss equipment.
I used a Leica IIIA in graduate school for recording oscilloscope images. We used an extension tube that had been fabricated in the campus machine shop with my Summar to allow focus up close to oscilloscope screen. At the end of each session, I removed the extension tube and photographed a blackboard with the experiment details in order to record the information on the same film strip as the oscilloscope traces.
Later we had an Olympus phase contrast microscope in the industrial laboratory where I was working. Olympus offered an (Olympus) rangefinder-less camera body
as an acessory for the equipment. I used a Polaroid back then for my work, another option which was offered. When we needed some presentation-quality enlargements we brought in our industrial photographer. He removed the Polaroid back and shot the images with the same 4x5 sheet film in Graphlex holders that he had been using for the previous 30 years. His enlargements were very good, indeed,