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 6320-01-281-6028
NSN 5990-00-499-9816
NSN 6145-01-015-6934
NSN 6610-00-239-4931
NSN 5910-01-226-7033
NSN 5945-00-242-1488
NSN 6135-00-080-9176
NSN 5950-00-243-9040
NSN 5895-00-917-8768
NSN 5998-01-025-6764
NSN 5945-00-454-7016
NSN 5855-01-089-2248