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 6320-01-538-0775
NSN 5905-01-027-8348
NSN 6645-01-256-3375
NSN 6135-01-231-3991
NSN 6130-01-211-7121
NSN 5855-00-089-3974
NSN 2925-01-244-3016
NSN 5895-01-015-7697
NSN 5998-00-440-6333
NSN 6320-00-242-3300
NSN 5925-01-277-0676
NSN 6685-00-467-6096