the Air films used some Microfilm technology. BUT anything like this is not only "special" but only even mentioned under security seal.
I understood that Eastman Park Micro-graphics who tool over the Kodak and RECORDAK microfilm and Business scanning programs, made and arrangement where AGFA materials in Belgum would stop selling there microfilm as COPEX, and instead sell it under the Imagecapture brand... Being slow, Microfilm tends to have a long shelf life and so the availability of Fuji Microfilm does not indicate current production.
one simalarity to the products metioned in the book, some Microfilm was made on a thin ESTAR base. one project I was involved with used rolls of 215 ft on a standard 100ft 16mm Microfilm spool. these are the same diameter as a 16mm 100ft Movie Spool, but made of plastic with drive holes instead of aluminum like the Movie Spools. The Kodak catalog back in teh day listed all sorts of special windings and packaging including rolls made for several specific machines from various Business equipment makers.
one of the biggest uses of Microfilm at one time was in the banking industry. Cheques before being shipped to another bank to be cleared, would be photgraphed on a "rotary" camera, and the film sent for processing. if a shipment of cheques was lost or destroyed, KOdak or another supplier could print facsimile copies so thet the funds could be cleared.