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: Articles of plastics & articles of other materials of heading 3901 to 3914, nesoi
NSN 5960-01-255-5580
NSN 2925-01-090-2391
NSN 6320-01-093-5738
NSN 5905-01-583-9624
NSN 6610-01-437-2506
NSN 6610-01-535-0310
NSN 5895-01-492-2739
NSN 6645-01-446-1994
NSN 6110-00-497-7139
NSN 6320-01-627-1594
NSN 5895-00-327-8805
NSN 6110-01-117-8836