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 5945-01-397-2758
NSN 5925-01-228-0604
NSN 6320-01-333-5782
NSN 6610-01-041-0555
NSN 6105-00-096-5832
NSN 5910-00-403-5814
NSN 5975-01-401-5355
NSN 5996-01-407-3777
NSN 6645-00-684-3424
NSN 6220-00-893-8777
NSN 6220-01-544-6013
NSN 6105-01-612-8172