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 5920-01-137-0068
NSN 5910-00-144-4383
NSN 6650-00-111-3399
NSN 6105-00-106-4393
NSN 6240-00-170-5302
NSN 6110-00-592-7474
NSN 5965-01-058-1076
NSN 5915-01-171-5727
NSN 5905-01-551-4013
NSN 6145-01-051-7012
NSN 5965-01-321-9039
NSN 6135-01-479-9790