Hardness critical item
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 6130-01-546-7759
NSN 5960-00-845-1043
NSN 6645-00-408-0304
NSN 4140-01-599-9383
NSN 6240-00-491-0517
NSN 5965-00-232-1925
NSN 2925-01-464-3093
NSN 6320-00-937-5625
NSN 5925-00-081-9135
NSN 6145-00-081-6686
NSN 5915-01-604-2947
NSN 5945-01-574-8664