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

Electrocardiograph by the Cambridge Instrument Co.

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

Timing device for E.C.G. machine

1927