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 5895-00-177-3610
NSN 7035-01-641-1452
NSN 5835-01-264-8782
NSN 6620-01-498-2052
NSN 5998-01-534-6226
NSN 5920-01-304-7587
NSN 6150-01-197-6993
NSN 6320-01-521-1764
NSN 6685-01-451-0154
NSN 6220-01-439-7474
NSN 6130-00-776-9817
NSN 5998-00-949-0695