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 5950-00-799-7405
NSN 6135-01-252-0315
NSN 6110-01-523-5596
NSN 5998-00-144-4404
NSN 6105-00-380-0309
NSN 5895-01-283-0952
NSN 5975-00-473-7859
NSN 6320-00-886-9771
NSN 2925-01-100-3694
NSN 6220-01-400-2108
NSN 5905-01-071-7351
NSN 6145-00-840-6685