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 5975-01-427-3521
NSN 5975-01-450-4614
NSN 5960-01-056-4982
NSN 4140-00-990-3311
NSN 7035-01-657-7183
NSN 5996-01-133-2478
NSN 6620-00-325-4693
NSN 6240-01-111-3394
NSN 5925-01-356-6161
NSN 5998-01-503-6819
NSN 5835-01-559-3824
NSN 5950-01-393-7350