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 5998-00-482-4808
NSN 5996-01-349-0261
NSN 5998-01-005-6885
NSN 5985-01-063-8181
NSN 2925-01-231-6312
NSN 5920-01-544-8371
NSN 5930-00-519-0294
NSN 6620-01-544-4857
NSN 6105-00-194-3377
NSN 5895-00-550-6580
NSN 5945-01-540-9380
NSN 5990-00-088-7591