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 2925-01-494-3259
NSN 6105-00-235-2932
NSN 6620-01-107-2965
NSN 6110-01-461-1058
NSN 5945-00-343-8447
NSN 5996-01-451-8141
NSN 6610-01-534-6377
NSN 6240-01-100-4158
NSN 6685-00-938-2808
NSN 5999-01-037-8645
NSN 5855-00-149-0766
NSN 6110-01-648-2637