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Davis' mid C19 magneto-electric therapy machine

1860-1900
Davis and Kidder's magneto-electrotherapy machine, hand-cranked, made by W H Burnap of Lowell, Mass., U.S.A., 1854-1898

Magneto-electrotherapy machine

1854-1880
Davis' mid C19 magneto-electric therapy machine, handcranked, by Burnap of Lowell, Mass., supplied by Mathews, London, U.S.A., 1860-1880

Davis' mid C19 magneto-electric therapy machine

1860-1880
Magneto-electric therapy apparatus, hand-cranked, probably infringeing Davis's USA patent of 1854

Magneto-electric therapy apparatus

1860-1900