Spencer/American Optical 
1953 AO SPENCER Model 5 Research  Microscope 1950 AO SPENCER Universal Microscope Lamp 1921 Spencer Portable Microscope Model 60H 197 0 AO SPENCER Military Microscope

1953 Model 5 Research  Microscope 1950 AO Universal Microscope Lamp 1921 Spencer Portable Microscope Model 60H  1970 Military Microscope