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 5855-00-131-6338
NSN 5910-01-384-4386
NSN 6240-00-841-0189
NSN 6320-01-021-6633
NSN 4140-00-512-1671
NSN 6645-01-204-9253
NSN 6645-01-627-6629
NSN 6220-01-386-3810
NSN 5935-00-004-8848
NSN 5999-00-419-3141
NSN 5975-01-533-4210
NSN 7035-00-337-8745