1801-1870, microscopist and photographic pioneer, English; British Reade, Joseph Bancroft 1801 - 1870
1801-1870, engineer; shipwright; naval architect, English; British Ditchburn, Thomas Joseph 1801 - 1870
1801-1865, optician, instrument maker, Birmingham and London, England, English Elkington, George Richards 1801 - 1865
1801-1870, optical instrument maker (microscope & telescope), German Steinheil, Carl August 1801 - 1870
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