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 5910-00-965-7818
NSN 2925-01-580-8072
NSN 7035-01-227-2546
NSN 6685-01-622-0383
NSN 7035-00-283-3112
NSN 5920-01-588-5121
NSN 4140-01-206-2397
NSN 6135-00-027-3914
NSN 5915-01-511-5371
NSN 6685-01-178-0979
NSN 5895-00-227-9936
NSN 5999-00-290-5898