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 6610-01-301-3513
NSN 6645-00-153-3834
NSN 6110-01-327-4036
NSN 6135-00-947-7091
NSN 6645-00-389-3370
NSN 6320-01-422-1212
NSN 6130-01-252-8351
NSN 5945-00-290-1779
NSN 5965-00-189-9394
NSN 5999-00-056-5461
NSN 5950-01-025-5826
NSN 5910-01-070-0556