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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 later C19 magneto-electric therapy machine with mechanism to show magnet keepers position on exterior dial, probably English-made, 1860-1890

Davis later C19 magneto-electric therapy machine

1860-1890
Magneto electrotherapy machine, Davis type, possibly made by Elliott of London, 1860-1920

Magneto electrotherapy machine

1860-1920