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 6130-01-363-1305
NSN 5985-00-354-3295
NSN 7035-01-406-5232
NSN 6645-00-388-3463
NSN 5920-00-227-6179
NSN 6320-01-139-0533
NSN 4140-00-402-3223
NSN 5930-01-236-9143
NSN 5996-01-517-6523
NSN 6320-01-145-9013
NSN 5985-00-421-2634
NSN 5960-01-258-0814