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 6130-01-381-2969
NSN 5910-01-567-9087
NSN 5960-01-386-5770
NSN 5975-01-588-5805
NSN 5905-01-384-1902
NSN 5835-01-463-2334
NSN 5950-01-634-0677
NSN 6240-01-498-8507
NSN 2925-01-426-3410
NSN 4140-00-200-9082
NSN 6105-01-246-0008
NSN 6110-00-611-1111