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The Research and Inspection (R&I) Division laboratory was located in an old mansion at 140 Boulevard Montparnasse, Paris. This map of Paris was marked by Harry Houck.
Upon reporting for duty at the R&I Division Lab, Armstrong was assigned to head the Airplane Radio Section.
E. H. Armstrong (front row end) and the R & I Division personnel on the steps of 140 Boulevard Montparnasse, Paris, 1917.
(Select here to view more Armstrong documents and photos during World War One)