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 5996-01-328-7454
NSN 5925-01-660-2124
NSN 6130-01-005-8916
NSN 6145-01-357-3426
NSN 5965-01-386-2988
NSN 6685-00-217-9010
NSN 6685-00-822-9465
NSN 4140-01-350-3277
NSN 6130-01-539-8112
NSN 7035-01-227-2546
NSN 5975-00-987-4342
NSN 6610-01-579-2675