Yes I remember using one to print the results from an experiment at my first job we had a rig that used a high speed cini camera to record the movement of an "object" when subjected to high flow regimes underwater.
To digitize it I covered the wall of a spare office with graph paper and projected the film onto the graph paper and manually using pencil marked up the graph paper then transcribed the x,y coordinates which I than plotted on a HP A3 plotter.
To digitize it I covered the wall of a spare office with graph paper and projected the film onto the graph paper and manually using pencil marked up the graph paper then transcribed the x,y coordinates which I than plotted on a HP A3 plotter.