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 4140-00-260-9521
NSN 2925-01-443-4216
NSN 6150-01-254-2764
NSN 5910-01-029-1787
NSN 6105-01-529-4771
NSN 6650-01-337-5309
NSN 5960-01-443-9681
NSN 6150-01-318-2495
NSN 6145-01-609-5743
NSN 5950-00-721-5642
NSN 6320-01-089-9086
NSN 5975-01-200-3379