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 6150-01-212-3522
NSN 5895-01-247-7375
NSN 6145-00-140-1605
NSN 5998-01-395-9576
NSN 5990-01-576-4383
NSN 2925-01-123-5856
NSN 5990-01-554-8547
NSN 5915-01-215-7405
NSN 4140-00-344-0365
NSN 6145-00-701-2987
NSN 4140-01-575-5362
NSN 6105-00-152-3825