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 6150-01-302-7711
NSN 4140-01-027-7516
NSN 6620-00-166-0556
NSN 5996-00-987-5409
NSN 5920-01-086-3258
NSN 5920-01-431-5791
NSN 5920-01-167-9678
NSN 6135-01-142-6456
NSN 6320-01-608-1935
NSN 5905-01-411-6204
NSN 6150-01-580-3426
NSN 5930-01-432-1143