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 2925-01-484-2775
NSN 7035-01-387-0493
NSN 6645-01-646-2953
NSN 5895-01-634-0630
NSN 5990-01-392-5682
NSN 6130-01-161-1735
NSN 6610-01-351-4607
NSN 5998-01-345-8801
NSN 5999-00-282-3150
NSN 5915-01-301-6093
NSN 6610-00-186-9180
NSN 4140-01-442-7799