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 5965-01-434-4095
NSN 6610-00-186-9180
NSN 2925-01-472-4144
NSN 5930-01-484-8751
NSN 5925-01-431-0405
NSN 6320-00-336-9123
NSN 5999-01-542-6446
NSN 5935-00-728-1445
NSN 5855-00-149-0766
NSN 5835-00-779-2836
NSN 5999-00-827-8238
NSN 2925-01-331-5039