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 5985-01-532-0415
NSN 5905-01-129-1213
NSN 5990-01-442-3520
NSN 5855-00-197-6387
NSN 6650-00-403-5251
NSN 5945-01-593-4019
NSN 5965-01-135-1336
NSN 6320-01-562-1599
NSN 6320-01-225-9963
NSN 5975-00-411-1689
NSN 5920-00-958-7202
NSN 6685-00-204-6037