A transparent item of a predetermined size that permits unobstructed and undistorted view of a desired area. It may include a frame, have reference markings, grid lines and may be heat strengthened and/or tinted. It is generally used where safety, security, and/or the restriction of foreign matter are required, such as the visual examination of the inside of pressurized tanks, liquid sights, controlled liquid flow, and inspection of equipment enclosed in a housing. See window (as modified); scale, cathode ray tube; scale, plotting; window, metal; window, wood; and window panel, aircraft.
Classification: Pressed or molded glass articles, wired or not, for building or construction;leaded glass windows etc; formed multicellular or foam glass
NSN 6240-01-487-4386
NSN 6610-01-618-4603
NSN 6150-00-938-6031
NSN 6130-00-411-9535
NSN 7035-01-204-7481
NSN 6105-01-554-3104
NSN 5996-00-420-4095
NSN 5990-01-319-5667
NSN 7035-00-834-2090
NSN 5960-01-485-7532
NSN 6620-01-390-1121
NSN 5925-01-655-7992