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 7035-01-191-2822
NSN 5930-01-549-9961
NSN 5996-00-931-9368
NSN 5999-00-898-4590
NSN 5985-01-286-6355
NSN 4140-01-568-0906
NSN 6145-00-427-7201
NSN 5985-01-295-6525
NSN 5950-00-470-7745
NSN 5950-00-773-9958
NSN 6220-01-540-8827
NSN 5945-01-534-2447