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 6130-00-187-0211
NSN 6110-00-636-1234
NSN 5975-01-400-3414
NSN 6645-01-116-9634
NSN 5990-00-372-5177
NSN 5985-01-246-8684
NSN 5950-00-099-9612
NSN 5905-01-517-7416
NSN 6150-01-134-3019
NSN 5990-01-433-3786
NSN 6145-01-028-4494
NSN 4140-01-620-4571