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 5910-01-349-9218
NSN 6105-01-003-9162
NSN 5925-00-493-5918
NSN 6610-01-629-4140
NSN 5930-00-367-6788
NSN 5925-01-483-1170
NSN 5895-01-421-2690
NSN 6645-01-645-4291
NSN 5996-01-578-6162
NSN 5920-00-480-5250
NSN 5855-01-076-5202
NSN 6320-01-434-6861