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 5975-01-379-1036
NSN 5990-01-114-5095
NSN 7035-00-511-0076
NSN 5935-01-531-7767
NSN 6650-00-078-5773
NSN 6130-01-432-2415
NSN 5935-01-359-3243
NSN 7035-01-263-5463
NSN 5985-00-591-3001
NSN 5950-01-250-0167
NSN 6105-00-134-0827
NSN 6110-01-596-7302