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 5920-00-038-6892
NSN 5960-01-654-4353
NSN 5915-01-532-2594
NSN 5905-01-517-8515
NSN 6320-01-078-8257
NSN 5915-01-537-6060
NSN 5945-01-245-3389
NSN 6105-00-881-0650
NSN 5855-01-462-0495
NSN 5999-01-557-1270
NSN 4140-01-621-4410
NSN 6130-01-148-2946