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Max Cohn, M.D.
JAMA. 1936;107(15):1212-1213. doi:10.1001/jama.1936.92770410001008.
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The making of roentgenograms in a hospital occasionally leads to a controversy between the patient, the physician and the roentgenologist over ownership of the original films.

Positive prints from roentgenograms are unsatisfactory, and except in certain simple cases the fine details of the original are inadequately reproduced.

Until recently it was necessary for the maker of a roentgenogram either to protect himself by keeping the film in his possession or to satisfy the physician and the patient at the risk of criticism, should he be unable to produce the film for medical or legal purposes at some future time.

A new photographic material called "Direct Duplicating Film"1 is now available. With this film any number of exact duplicates can be produced from original roentgenograms by direct contact printing without the necessity of making an intermediate film with consequent loss of detail. The film has characteristics exactly opposite those


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