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 5915-00-175-8657
NSN 6110-00-236-4161
NSN 5996-00-768-7241
NSN 5998-01-634-0604
NSN 6135-01-222-0703
NSN 5915-00-050-1307
NSN 6685-00-527-7262
NSN 5975-01-411-3684
NSN 4140-01-512-7286
NSN 5990-01-633-9503
NSN 6685-01-371-1624
NSN 5945-00-274-5690