Bausch and Lomb
1908 Carbon Arc Balopticon C 1910 Carbon Arc Balopticon B 1930's B&L Research Lamp Bausch & Lomb DDE Microscope 1929 1930's Balopticon BDT 1930's B&L DDS Research Microscope
1908  Carbon Arc Balopticon C 1910  Carbon Arc Balopticon B 1930's  Research Lamp 1929 DDE Microscope 1930's Balopticon BDT 1930's DDS Research Microscope
1930's Wide Field Illuminator
 1936 BKW wide field stereo 1940 B&L AA Microprojector 1960 B&L Microprojector
1930's Wide Field Illuminator 1936 BKW wide field stereo 1940  AA Microprojector 1960 Microprojector