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 5935-00-171-8837
NSN 5945-01-011-1511
NSN 6610-00-430-5208
NSN 5985-01-474-4409
NSN 5950-01-247-4064
NSN 2925-00-183-4390
NSN 5960-01-573-6483
NSN 5855-00-411-8688
NSN 5925-00-353-0612
NSN 6130-00-538-9798
NSN 6130-01-313-4242
NSN 5910-00-350-8378