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 6650-00-901-4914
NSN 5905-01-652-0192
NSN 5905-01-384-2789
NSN 5920-01-461-4258
NSN 5920-01-358-2518
NSN 5985-01-085-5573
NSN 5996-01-535-9175
NSN 5915-01-468-5518
NSN 6110-01-150-7520
NSN 5960-01-033-5071
NSN 2925-01-156-9570
NSN 5985-00-252-7431