| 摘要 |
<p>A roll film cassette has a tubular wall provided with an axially extending film slot. At least one open axial end of the tubular wall is provided with an axially projecting rib. A cover for this open end is formed with an annular recess in which the rib is receivable to form with the cover a labyrinth-type light seal; the recess is interrupted at one location by a projection which enters into the film slot when the cover is in position closing the open end.</p> |
