General usage
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 5905-01-509-4571
NSN 6145-00-598-9397
NSN 5855-01-525-8017
NSN 6685-01-268-1724
NSN 5915-00-412-1691
NSN 2925-01-422-1542
NSN 6320-01-214-0350
NSN 5990-01-654-6203
NSN 6320-01-220-2264
NSN 5950-01-154-9591
NSN 2925-01-495-9669
NSN 5999-00-461-4099