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 5835-00-275-0584
NSN 5930-01-252-8687
NSN 6220-00-465-6302
NSN 6620-00-308-2531
NSN 5965-00-240-5777
NSN 5998-00-261-6891
NSN 6685-00-654-9912
NSN 6650-01-619-9986
NSN 7035-00-763-6180
NSN 6645-01-571-6404
NSN 6685-01-415-0574
NSN 7035-01-224-5165