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 5930-01-332-2330
NSN 6610-00-980-0518
NSN 5915-01-094-7847
NSN 6105-01-276-0997
NSN 6620-00-555-3992
NSN 5998-01-512-9841
NSN 5950-01-485-3518
NSN 5975-01-299-1507
NSN 6150-01-246-4050
NSN 5905-00-308-0964
NSN 5935-01-069-3867
NSN 5855-00-228-8446