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 6220-01-570-9602
NSN 5835-00-933-9609
NSN 5920-00-770-2015
NSN 5920-01-013-2389
NSN 6620-00-233-6839
NSN 5925-01-147-8848
NSN 6650-01-177-4398
NSN 6685-01-633-2139
NSN 5835-01-058-0233
NSN 6130-00-153-3136
NSN 6150-01-531-4328
NSN 6320-01-506-9439