The Cinelarger was manufactured by Testrite Instrument Company as a means to allow users to create single frame still blowups of home movies. It uses medium format film and the intention was to produce a negative large enough for contact printing although they can be enlarged. The earlier models uses 620 film and the later uses 120 size film. Both films are identical, but used slightly different spools. 620 is no longer available, but 120 film can be re-spooled on to a salvaged 620 spool. Each film size requires a different Cinelarger. Known sizes are 16mm, 8mm, Super 8mm. The later manual mentions one for Fuji Single 8mm. There was also a model for making negatives from 35mm slides.
Cinelargers show up from time to time on eBay, The seller often knows nothing about them so they are frequently miss described and misspelled. I have picked up several in the $8-15 range.