This folder contains correspondence concerning the technical and commercial development of Edison's battery-powered safety lamp and its attachment to headgear for a portable, hands-free light source. Included are numerous communications to Edison from chief engineer Miller Reese Hutchison. Some of Hutchison's communications are copies of letters from H. H. Meno Kammerhoff, who visited Alabama, Tennessee, and Pennsylvania in 1913 to demonstrate the competitive advantages of Edison's safety lamp to purchasing and engineering personnel at coal and iron mining companies. Also included is correspondence with representatives of the General Electric Co. Additional documents by members of Edison's Legal Department include references to U.S. and foreign patent rights, as well as potential patent infringements.

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