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 6135-01-127-0173
NSN 6150-01-235-5822
NSN 2925-00-573-9556
NSN 6135-01-306-6549
NSN 6150-00-194-3098
NSN 6135-01-593-9256
NSN 7035-01-369-1445
NSN 6110-01-423-9193
NSN 5975-01-092-0295
NSN 6240-00-170-5302
NSN 5945-00-233-5655
NSN 5895-00-310-0185