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 6110-00-691-9134
NSN 6685-01-617-7177
NSN 5930-00-622-0854
NSN 5925-01-519-8906
NSN 5835-01-123-8305
NSN 5835-01-038-8459
NSN 5999-00-027-0218
NSN 5950-00-139-5718
NSN 5835-00-594-4921
NSN 5960-01-462-1864
NSN 6620-01-495-7446
NSN 5935-01-291-7631