| 摘要 |
A device making it possible to tell whether or not a 135-type film has been exposed, without it being necessary to have the film developed in the event of a doubt, consists of a series of perforated roundels (washers) (1) of increasing diameter, the diameters lying between that of the central spool (2) of the film and that of one of the two original roundels (3) of a 135-type film, all of the washers of the device receiving an internal "tooth" (5) and an external "tooth" except for the largest roundel (6) which will have just one internal "tooth" but which will support an identification system, the whole device being covered by a piece (7) equipped with a viewing opening (8), the device being set off by unwinding the film, bringing about rotation of the central spool (2) of the film which will trigger the device. <IMAGE> |
