Photographic film cassette

A photographic film cassette for use in a camera, said cassette including a spool, a photographic film roll coiled on said spool with a trailing end of a photographic film attached to said spool, and a lighttight cassette body for rotatably supporting said spool, said photographic film cassette further comprising:

• film advancement means for advancing a leader end of said photographic film outwardly from the interior of said cassette body in accordance with rotation of said spool when said spool is rotated in a film unwinding direction;
• spool lock means for preventing said spool from being rotated;
• and
• indicator means for indicating an exposed state and an unexposed state of said photographic film;
• wherein said indicator means is associated with said spool lock means, changes form said unexposed state indication to said exposed state indication when said spool lock means unlocks said spool for the first time, and remains in said exposed state indication when said spool lock means returns to its spool locked state.

A photographic film cassette including a spool, a photographic film roll coiled on said spool with a trailing end of a photographic film attached to said spool, and a lighttight cassette body for rotatably supporting said spool, said photographic film cassette further comprising:

• film advancement means for advancing a leader end of said photographic film outwardly from the interior of said cassette body in accordance with rotation of said spool when said spool is rotated in a film unwinding direction;
• spool lock means for preventing said spool from being rotated;
• indicator means associated with said spool lock means, said indicator means changes form said unexposed state indication to said exposed state indication when said spool lock means unlocks said spool for the first time, and remains in said exposed state indication when said spool lock means returns to its spool locked state;
• and
• indication changing means for changing said indicator means from an unexposed state indication to an exposed state indication by moving said indicator means in response to a film cassette loading operation into a camera or to a camera sequence action.