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Electro-cardiograph, part of apparatus only, section for determining optical ray, steel with brass terminals, in oak case, English, c.1930

Electro-cardiograph, part of apparatus only

1930
Electrocardiograph, portable, with cover and accessories, by Cambridge Instrument Co. Ltd. , English, 1958

Electrocardiograph, portable, with cover and accessories

1958
Electrocardiograph by the Cambridge Instrument Co., Cambridge, England, 1930, used by the British Royal Hospital, 1930-1964

Electrocardiograph by the Cambridge Instrument Co.

1930
Timing device for E.C.G. machine, by Cambridge Instrument Co., English, 1927

Timing device for E.C.G. machine

1927
Vibrating bar designed to supply current at 50Hz to time-marker used with electrocardiograph, by Cambridge Instrument Company Ltd., England, 1934

Vibrating bar designed to supply current at 50Hz to time-marker used with electrocardiograph

1934