DAVIS & KIDDER'S PATENT MAGNETO-ELECTRIC MACHINE,Circa 1890; W.H. Burnap, New York. The interior cover with paper label detailing instructions for use and stating "for nervous diseases". Together with an early cased medical electrical machine, 5 in. x 9 1/2 in. x 5 1/2 in.
- 4 1/4 in. x 10 in. x 4 1/2 in. Estimate $300-400