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 6620-00-115-9050
NSN 5920-01-202-1982
NSN 5998-00-406-4413
NSN 5985-01-053-3618
NSN 5950-00-964-4363
NSN 6645-01-231-9891
NSN 6685-01-215-7629
NSN 5905-01-104-4590
NSN 6135-00-128-1633
NSN 5975-01-339-0101
NSN 6650-01-446-8752
NSN 6220-01-328-2665