active 1910s-1950s, manufacturer of electrical instruments & X-ray equipment, London, England Newton and Wright Limited
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 c.1860s-1876, opticians & scientific instrument maker (electrical), London, England Tisley and Spiller
