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 6620-01-212-4298
NSN 5905-00-311-8573
NSN 6135-00-196-5267
NSN 6685-00-023-5933
NSN 5835-01-268-1924
NSN 6650-00-443-4292
NSN 5835-00-794-7500
NSN 5935-01-023-8282
NSN 6150-00-475-5383
NSN 6645-01-223-7274
NSN 5950-01-423-0082
NSN 6620-01-355-4339