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 5975-01-564-1578
NSN 2925-00-494-5537
NSN 6135-01-442-4581
NSN 5930-01-496-5188
NSN 6650-01-257-7237
NSN 5975-01-155-7084
NSN 5895-01-399-7914
NSN 6645-01-602-0000
NSN 5985-00-011-6921
NSN 2925-01-570-8065
NSN 2925-01-497-9381
NSN 5999-00-588-2516