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 6145-00-422-2644
NSN 5960-01-077-4551
NSN 6110-01-385-7177
NSN 6650-01-316-1191
NSN 5835-01-431-6877
NSN 5996-01-622-0076
NSN 5950-01-094-7984
NSN 6685-01-471-7904
NSN 5965-01-461-7195
NSN 5985-00-913-9842
NSN 5999-01-202-8282
NSN 6650-01-145-5663