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 5935-01-265-3085
NSN 6650-01-470-1315
NSN 6150-01-188-7317
NSN 6620-00-190-8109
NSN 6110-01-447-2770
NSN 5910-01-039-9566
NSN 5999-01-655-8179
NSN 5920-01-574-4528
NSN 6650-01-548-7915
NSN 6650-00-252-2541
NSN 6130-01-525-7519
NSN 5975-00-109-5370