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 6645-01-444-8918
NSN 6685-00-703-1694
NSN 6620-00-572-8787
NSN 5945-00-928-6198
NSN 6145-01-600-0910
NSN 5950-01-235-1249
NSN 5999-01-613-8310
NSN 5915-01-169-4091
NSN 5960-00-529-2704
NSN 5999-01-103-9501
NSN 6240-01-369-6464
NSN 5996-01-233-7905