Dr Land and Polaroid came up with a million ways to use instant photography, much of it in professional fields. From dentistry and forensics to passport photos, the ubiquity of instant photography ideas were endless. Not only were cameras constructed for very specific applications, but films were made with built in grids, heightened uv sensitivity, and never before achieved film speeds (iso 20,000).
My collection mostly falls into three categories: dental macro cameras, oscilloscope cameras, and passport cameras. I also have a couple stand alone oddballs like the microscope camera. The film ranges from traditional pack-film to specialized Spectra film. Two are full slr cameras. Others have preview windows built into the hood, and some use two lasers that form a cross on the subject when you are in focal distance!
I am sure there are millions of these special use cameras out there. If you get the chance- snag one. They are quite fun to shoot, and the looks you get are worth the low dollars they typically command!