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 6130-00-605-7887
NSN 5930-00-843-2366
NSN 5990-01-517-7848
NSN 2925-01-548-6674
NSN 5910-01-286-1543
NSN 6130-01-129-6499
NSN 6220-01-189-7990
NSN 5965-00-055-8013
NSN 6685-01-596-1480
NSN 6130-01-571-6745
NSN 5925-01-171-3637
NSN 5950-01-519-3329