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 5905-01-494-4398
NSN 4140-01-442-3063
NSN 5960-00-686-0559
NSN 5855-01-319-9757
NSN 5990-00-113-6137
NSN 6110-01-355-4536
NSN 7035-01-549-3616
NSN 5985-01-555-6652
NSN 5960-01-146-0289
NSN 5925-00-957-9894
NSN 5835-00-864-4481
NSN 6105-01-181-9906