Oblique transmission illumination inspection system and...
Opacity measuring apparatus
Optical analysis of biomedical specimens
Optical apparatus
Optical cigarette end inspection device
Optical density measurement
Optical device for measuring the turbidity of a liquid
Optical device for monitoring clarity of a fluid
Optical inspection apparatus for pressurized vessels
Optical inspection insertion apparatus for pressurized vessels
Optical inspection systems
Optical multiple-reflection arrangement
Optical reflectance gauge and method therefor
Optical sight tube for flowing fluid materials
Optical sight tube for fluid conduits
Optical tube inspection apparatus
Organic vapor detection with liquid crystals
Orientation indicator for a flexible fiberscope or endoscope inc