AIR FORCE MIL-P-4278C
AR FORCE ML-P-4278C 1959-DEC-15 PRNTER PROJECTON PHOTOGRAPHC TYPE E-1
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This specification covers one type of fixed focus automatic enlarging printer for printing 35 millimeter single frame, 70 millimeter, and 5-inch roll negatives, designated Type E-l. The printer is intended for use in both step, repeat, and continuos modes of printing.