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 5855-01-641-8295
NSN 5960-00-215-5884
NSN 5905-01-354-5132
NSN 5996-01-398-4755
NSN 7035-00-978-7837
NSN 6645-01-549-8910
NSN 5950-01-524-7743
NSN 4140-01-054-8516
NSN 6240-01-416-2333
NSN 6320-00-110-8005
NSN 5999-01-046-1800
NSN 5910-01-378-6721