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 6110-00-137-2348
NSN 5835-01-254-8584
NSN 5999-01-015-9173
NSN 6135-00-351-8606
NSN 6645-01-476-3660
NSN 5915-01-027-0800
NSN 5975-01-604-5146
NSN 6220-01-027-1294
NSN 6145-01-293-2055
NSN 5990-01-526-9941
NSN 6150-00-596-9253
NSN 6610-01-567-3026