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 5985-00-167-4922
NSN 6610-01-568-7611
NSN 5975-01-289-3504
NSN 6650-01-082-9046
NSN 6685-00-874-7240
NSN 5930-00-832-8364
NSN 5975-01-233-0395
NSN 6105-01-394-2603
NSN 5998-01-354-9756
NSN 5965-00-116-5363
NSN 5945-01-255-9658
NSN 5999-01-044-0394