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 6130-01-529-2799
NSN 6150-00-398-6527
NSN 5945-01-388-1997
NSN 6220-01-328-7523
NSN 5930-01-466-5402
NSN 6685-01-618-3896
NSN 6145-01-317-4108
NSN 5965-00-436-2226
NSN 6610-00-185-9434
NSN 6320-00-681-1324
NSN 5985-00-572-8585
NSN 6145-01-017-9567