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 6610-01-425-1523
NSN 5905-01-043-1036
NSN 6145-01-034-3534
NSN 4140-01-452-2980
NSN 5998-00-754-7492
NSN 4140-00-735-9309
NSN 5965-01-200-6613
NSN 5910-01-345-1811
NSN 5930-01-190-1310
NSN 5999-01-311-3217
NSN 6240-01-037-0975
NSN 6645-00-192-1152