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 5920-00-359-9771
NSN 6145-00-454-0566
NSN 5855-01-131-5166
NSN 5975-01-302-3918
NSN 5910-01-175-5712
NSN 7035-01-365-9610
NSN 6145-01-380-0065
NSN 5835-00-617-3578
NSN 5835-00-830-6416
NSN 5998-01-486-7841
NSN 6130-01-395-6596
NSN 5996-00-205-2933