1900-1995, manufacturer of earthenware; manufacturer of majolica, Stoke on Trent, England Grimwades Limited 1900 - 1995
1900-1915, manufacturer of pharmaceuticals, Chicago, United States Abbott Alkaloidal Company 1900 - 1915
1900-1907, manufacturer of electrical measuring equipment, Glasgow, Scotland Kelvin and White 1900 - 1907
1900-1998, electrical/electronic measurement instrument manufacturer, England Marconi Instruments Limited 1900 - 1998
active 1900s-2009, manufacturer of dyestuffs, Bromborough, England Brotherton and Company Limited 1900 - 2009
1900-1979, physicist; inventor of holography; humanist; electronics engineer, Hungarian; British Gabor, Dennis 1900 - 1979
1900-1973, artist; painter; printmaker; engraver (printmaker); woodengraver; poster artist, British Malet, Guy 1900 - 1973
active 1900-1910s, manufacturer of time recorders. London, England British Time Recorder Company Limited 1900
1921-?, family planning, health and marital advice clinic, London, England, British The Mother's Clinics of the Society and Clinic for Constructive Birth Control and Racial Progress 1800