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 5996-01-629-5343
NSN 6240-01-285-7616
NSN 5960-01-136-5737
NSN 5998-01-270-2086
NSN 6610-00-963-9435
NSN 5960-01-658-9538
NSN 5985-00-263-7870
NSN 5905-01-235-3830
NSN 5965-00-252-6014
NSN 4140-00-088-7999
NSN 6145-01-564-9204
NSN 5945-00-782-1799