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 6110-01-350-6995
NSN 6320-01-171-3238
NSN 5998-01-200-7715
NSN 6610-01-383-6982
NSN 6150-01-236-4294
NSN 5935-01-247-5988
NSN 6150-01-388-2421
NSN 5920-01-278-6508
NSN 5935-01-350-4128
NSN 5935-00-926-7596
NSN 5996-01-584-4972
NSN 4140-01-123-9149