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 6220-01-594-5878
NSN 6685-00-951-5971
NSN 5920-00-672-5583
NSN 5998-00-540-9248
NSN 7035-00-849-5526
NSN 6145-01-611-6086
NSN 5895-00-157-4170
NSN 5925-01-442-5795
NSN 2925-01-480-1208
NSN 6645-01-190-4297
NSN 6150-00-620-6012
NSN 5935-01-508-4753