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 6130-01-273-9265
NSN 6135-01-035-1871
NSN 5925-00-425-3424
NSN 5930-01-561-9494
NSN 5975-00-725-1287
NSN 4140-01-634-0330
NSN 5999-01-252-8812
NSN 6620-00-431-3837
NSN 5985-01-606-0083
NSN 5945-01-110-4604
NSN 5930-01-420-7225
NSN 5998-01-647-9821