active 1967-1974, electrical scientific instruments manufacturer, London, England, British Cambridge Scientific Instruments Limited 1967 - 1974
active 1895-1919, electrical measuring & scientific instruments maker, Cambridge, England The Cambridge Scientific Instrument Company Limited
active 1881-1895, maker of electrical measuring & scientific instruments, Cambridge, England The Cambridge Scientific Instrument Company
active 1871/5-1880s, electrical measuring and scientific instrument makers, French E Ducretet and Company