1. The interrupted high-voltage primary, or mixed current Author(s): Engelmann, George J. (George Julius), 1847-1903 Publication: [Philadelphia? : s.n., 1894?] Subject(s): Electric Stimulation Therapy -- instrumentation
2. A year's work in electro-therapeutics concerning the merits of differently made apparatus Author(s): Blackwood, W. R. D. (William Robert Douglas), 1838- author Publication: Baltimore : Press of Phister Printing Co., [1894?] Subject(s): Electric Stimulation Therapy -- instrumentationElectric Power Supplies