US4024557A - Film magazine having film speed indicating means - Google Patents

http://www.google.de/patents?id=YQg9AAAAEBAJ&printsec=frontcover&dq=4,024,557&hl=en&ei=XMMqTq26FMKp8QOMzpiMDA&sa=X&oi=book_resul

A film magazine comprised of a cylindrical portion and a pair of end covers is provided with film speed indicating code means. The cylindrical portion of the film magazine is made of metal sheet applied with an insulating coating layer. The surface…