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 5910-01-025-5408
NSN 6145-00-674-1807
NSN 5998-01-177-5411
NSN 6105-01-285-1887
NSN 6110-00-867-6860
NSN 6130-00-881-0751
NSN 5996-00-558-6491
NSN 5920-01-328-7159
NSN 6650-00-469-6682
NSN 6685-00-480-5876
NSN 5999-01-044-1469
NSN 6320-00-593-0379