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 6220-01-507-7641
NSN 5920-01-463-4826
NSN 5925-00-617-8313
NSN 6110-00-141-1966
NSN 5999-01-433-6774
NSN 5835-00-008-9619
NSN 5999-00-385-1722
NSN 5975-01-455-0215
NSN 6685-01-381-0759
NSN 6130-00-862-8737
NSN 6220-01-055-6555
NSN 5999-00-682-1040