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 5996-01-312-3508
NSN 5935-00-639-1382
NSN 6105-01-188-2902
NSN 6685-01-368-7142
NSN 5895-01-354-5556
NSN 6135-00-268-8492
NSN 5960-01-425-1454
NSN 5990-01-436-7191
NSN 5855-01-175-2465
NSN 5905-00-438-3378
NSN 6320-01-006-6138
NSN 5985-00-412-8061