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 6220-00-222-5663
NSN 6320-01-429-9871
NSN 5990-00-050-7693
NSN 6135-01-299-7252
NSN 5855-01-363-1143
NSN 5915-00-938-7395
NSN 4140-01-576-6293
NSN 5950-01-382-9337
NSN 5999-01-383-6821
NSN 6610-01-085-2072
NSN 5835-01-200-7153
NSN 5960-01-064-7121