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 7035-01-521-3449
NSN 5999-01-346-7755
NSN 5999-00-156-0991
NSN 5975-01-384-6063
NSN 6685-01-500-1810
NSN 4140-00-470-0530
NSN 5855-01-188-4049
NSN 5999-01-550-2224
NSN 5996-00-951-9181
NSN 5985-01-007-5062
NSN 6105-01-495-7548
NSN 6320-01-209-0952