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 6645-01-493-2620
NSN 5935-00-922-1623
NSN 6220-01-125-0468
NSN 5910-00-292-0048
NSN 6240-01-071-1507
NSN 6135-01-210-8715
NSN 6135-00-686-4777
NSN 6220-01-560-8821
NSN 6620-01-519-2628
NSN 5999-01-512-8174
NSN 5910-01-643-5704
NSN 6620-01-044-3371