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 4140-00-542-3298
NSN 5920-01-222-5107
NSN 5945-01-366-3123
NSN 5835-01-286-6499
NSN 5905-00-707-1030
NSN 5935-01-360-6127
NSN 6150-00-549-9779
NSN 6620-00-646-9474
NSN 6135-01-260-7180
NSN 5990-01-392-5682
NSN 5925-01-565-3465
NSN 5985-00-422-5337