An examination of the mortality experience of the members of a movie projectionist union in the United States has revealed no significant difference between the group that entered prior to 1940 and the group that entered after 1940, nor was their mortality experience greater than that of the general population. It is concluded, therefore, that the possible different levels of exposure of the two groups to the gases and fumes from carbon arcs and to the heat stresses did not contribute significantly to their mortality.
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