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 5999-01-481-3744
NSN 7035-00-225-6499
NSN 6150-00-142-9142
NSN 2925-01-408-6205
NSN 5960-01-032-4229
NSN 6320-00-394-8458
NSN 7035-00-631-3782
NSN 6145-01-452-1966
NSN 6320-01-389-8128
NSN 5999-00-103-1443
NSN 5910-01-104-3917
NSN 5915-00-679-1989