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 5996-01-457-9158
NSN 6130-00-850-5381
NSN 5905-01-078-6638
NSN 6320-00-036-3688
NSN 5915-01-645-4809
NSN 5965-01-647-4195
NSN 6150-01-542-3583
NSN 5990-01-595-9441
NSN 5999-01-447-2051
NSN 4140-01-633-1733
NSN 5985-01-545-2963
NSN 5920-00-189-0858