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 6650-01-515-0391
NSN 5910-01-012-9411
NSN 5975-01-268-7821
NSN 6105-01-333-3983
NSN 5985-00-780-8829
NSN 6145-01-346-7877
NSN 5965-00-207-6085
NSN 6130-01-504-9663
NSN 6105-00-691-2209
NSN 5985-00-106-9603
NSN 6105-01-281-0096
NSN 5835-01-193-6192