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
Magneto-electric therapy apparatus, hand-cranked, probably infringeing Davis's USA patent of 1854 Magneto-electric therapy apparatus 1860-1900
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