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 5930-01-565-0853
NSN 6145-00-943-0729
NSN 5920-00-853-8266
NSN 6135-01-180-9611
NSN 6620-01-112-6440
NSN 6620-01-418-3245
NSN 6145-01-631-7264
NSN 5985-00-163-9180
NSN 6220-00-470-6828
NSN 5915-01-180-7199
NSN 5950-01-507-3732
NSN 6145-00-431-8376