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 5855-01-141-8227
NSN 6135-01-604-8739
NSN 5910-01-521-3684
NSN 5855-01-339-1718
NSN 6145-01-475-6681
NSN 6130-01-472-6717
NSN 6105-01-010-5953
NSN 6685-01-391-4402
NSN 7035-00-076-4097
NSN 6240-01-044-0073
NSN 4140-01-415-6013
NSN 5930-00-159-7467