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 6645-01-303-5855
NSN 6685-00-095-6147
NSN 6145-01-217-6854
NSN 7035-00-703-3535
NSN 6130-01-564-3884
NSN 6650-01-660-7801
NSN 6240-00-635-9798
NSN 5930-01-392-0897
NSN 5835-01-274-1035
NSN 6135-01-384-7155
NSN 5998-01-180-9591
NSN 6105-01-134-5499