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 6610-01-520-6889
NSN 6620-00-876-0776
NSN 5999-00-803-3939
NSN 6650-01-168-8451
NSN 5965-01-111-6031
NSN 6110-01-450-9520
NSN 4140-00-193-8879
NSN 6685-01-147-8369
NSN 5999-01-397-9939
NSN 5965-01-258-5662
NSN 5985-01-160-8809
NSN 5990-00-351-5479