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 5990-01-127-1108
NSN 6320-00-036-3688
NSN 6110-00-384-1704
NSN 6220-01-427-2333
NSN 5920-01-549-1289
NSN 6645-01-575-4181
NSN 6135-01-329-7994
NSN 5910-01-274-3248
NSN 6105-01-032-4228
NSN 6145-01-317-4108
NSN 5965-01-085-6158
NSN 6645-01-188-5237