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 5950-01-592-3145
NSN 6150-01-265-1142
NSN 5835-01-319-4636
NSN 6110-00-597-8072
NSN 2925-01-097-0903
NSN 6145-00-891-6779
NSN 6610-00-826-7235
NSN 6685-01-196-6378
NSN 5925-01-225-9398
NSN 5930-00-000-0117
NSN 6145-01-395-2136
NSN 5935-01-147-5432