License folder containing a Mechanic's Identification Card and five Mechanic's License Cards issued by the United States Department of Commerce, Aeronautics Branch, to Paul R. Gruhler as a licensed Engine Mechanic. The Identification Card issued on 16 October 1927 contains a photograph of Gruhler. All the license cards expired on the 15th of October in years: 1929, 1931, 1933, 1935, and 1937.
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