c.1863 - 1946, surgical instrument maker, London, England Down Bros and Mayer and Phelps Limited 1863
1891-active 1940s, silversmith; medalmaker, England Alexander Clark Manufacturing Company Limited 1912
1895-c.1950, gas and laboratory equipment manufacturer, Warrington, Cheshire, England Fletcher Russell and Company Limited 1895
active 1890-1960s, manufacturer of gas meters, Westminster, London Alexander Wright and Company Limited
active 1790-1940, hydrometer & mathematical instrument maker, optician, London, England Dring and Fage
active 1906/7-1953?, electrical domestic appliance manufacturer, Chicago, United States Hurley Machine Company
1907-1927, camera and photographic equipment manufacturer, Rochester, New York Folmer-Schwing Division of Eastman Kodak 1907 - 1945
1845-c. 1955, lens manufacturer; scientific instrument maker, Paris, France Lerebours et Secretan 1845 - 1955
active 1904-1948, optical instrument maker (spectroscopes etc.), London, England Adam Hilger Limited 1904 - 1945
1850s- 1976, pharmaceutical chemist; optician, Leeds, England Reynolds and Branson Limited 1852 - 1976
active 1818-1856, optician, optical, mathematical & philosophical instrument maker, London, England Watkins & Hill 1818 - 1856
active 1806-1840, optician, mathematical, drawing & philosophical instrument maker, London, England Schmalcalder, Charles Augustus 1786 - 1843
1903-, manufacturer of scientific instruments, Acton, London; Watford, England S G Brown Limited 1903
1812-1887, active 1835-1878, optician, optical, mathematical & philosophical instrument maker, British Dancer, John Benjamin 1812 - 1887
