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 5990-01-328-9846
NSN 5990-01-124-9063
NSN 5950-01-030-7038
NSN 5960-01-218-2858
NSN 5915-01-033-2414
NSN 6145-00-846-3207
NSN 6645-01-005-8622
NSN 6220-01-446-6430
NSN 5975-01-474-5631
NSN 5998-01-337-6815
NSN 6220-00-528-7752
NSN 5975-01-169-8211