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 6610-00-886-6998
NSN 6610-01-296-2104
NSN 5915-01-422-1861
NSN 5950-01-070-8679
NSN 5998-01-170-9685
NSN 5910-00-188-5632
NSN 5910-00-150-8653
NSN 5985-00-162-2038
NSN 6685-00-365-5572
NSN 5985-01-221-6293
NSN 6110-01-649-1302
NSN 5999-01-025-0481