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 6150-01-242-9684
NSN 6610-01-439-2651
NSN 5915-01-557-4535
NSN 5965-01-576-6975
NSN 5965-01-311-1376
NSN 6685-01-167-4298
NSN 5915-01-302-8557
NSN 7035-01-068-5077
NSN 6110-00-582-7504
NSN 4140-01-441-9170
NSN 6650-01-656-0406
NSN 6685-00-089-9614