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 4140-00-044-1329
NSN 6150-01-412-8041
NSN 5930-00-036-7202
NSN 6105-00-726-2426
NSN 6650-00-273-8732
NSN 5985-00-277-7371
NSN 4140-00-959-4255
NSN 5998-01-175-4449
NSN 6685-01-090-0613
NSN 7035-01-265-0216
NSN 5915-01-516-3630
NSN 5975-01-447-2771