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
Dale-Schuster pump, double, with spirometer for measuring oxygen consumption, European, c. 1927 Dale-Schuster pump, Europe, 1922-1932