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 5935-00-257-9421
NSN 6685-00-374-0482
NSN 5915-01-090-9122
NSN 6645-01-207-9273
NSN 5960-00-496-4132
NSN 6135-01-238-2878
NSN 6135-01-116-3385
NSN 5935-01-411-6300
NSN 5950-00-982-0183
NSN 5935-01-335-7269
NSN 5960-01-250-1095
NSN 5996-01-294-9831