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 6650-01-555-7384
NSN 5975-00-501-0573
NSN 5920-00-285-2245
NSN 5975-00-016-9774
NSN 5965-01-548-5359
NSN 6650-01-388-1140
NSN 5999-00-288-5954
NSN 5920-00-549-2203
NSN 5960-01-325-2241
NSN 6620-00-481-4210
NSN 5975-00-563-3607
NSN 5945-01-203-1554