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 5910-01-394-1729
NSN 5930-00-168-4444
NSN 6610-01-269-5437
NSN 5920-01-033-4891
NSN 5999-00-434-5475
NSN 5965-01-584-3644
NSN 6240-00-968-7971
NSN 5895-00-852-4237
NSN 4140-01-144-3751
NSN 5945-00-805-2086
NSN 6105-00-051-9924
NSN 5998-01-035-7277