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 5910-01-144-3106
NSN 5920-01-423-4775
NSN 5920-01-020-7659
NSN 4140-01-322-5182
NSN 6135-00-166-5984
NSN 5910-01-482-0404
NSN 2925-00-516-8841
NSN 5975-01-571-5156
NSN 6105-01-010-2801
NSN 5930-01-141-2058
NSN 6240-01-425-5655
NSN 5990-01-386-5561