Electrical switch, one of four, for physiological use, by C.F. Palmer, London, 1920-1940 Electrical switch 1920-1940
Electrical switch, one of four, for physiological use, by C.F. Palmer, London, 1920-1940 Electrical switch 1920-1940
Electrical switch, one of four, for physiological use, by C.F. Palmer, London, 1920-1940 Electrical switch 1920-1940
Electrical switch, one of four, for physiological use, by C.F. Palmer, London, 1920-1940 Electrical switch 1920-1940
Electrical switch, one of four, for physiological use, by C.F. Palmer, London, 1920-1940 Electrical switch
Electrical switch, one of four, for physiological use, by C.F. Palmer, London, 1920-1940 Electrical switch
One of two du Bois-Reymond sledge coils, for physiological use, by C. F. Palmer, 403 Brixton Road, London, SW9, England, 1920-1940. One of two du Bois-Reymond sledge coils