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: Pressed or molded glass articles, wired or not, for building or construction;leaded glass windows etc; formed multicellular or foam glass
NSN 6110-00-141-1966
NSN 5935-00-943-0432
NSN 6145-01-028-0336
NSN 6620-01-588-5247
NSN 6685-01-167-8612
NSN 6320-01-456-2859
NSN 5855-01-406-4821
NSN 5965-01-343-3950
NSN 6240-00-228-8594
NSN 5930-01-564-5786
NSN 6105-01-175-9061
NSN 6110-01-652-0070