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 6685-01-406-5348
NSN 7035-00-861-7913
NSN 6620-01-412-0938
NSN 5915-00-274-2282
NSN 6645-01-338-9152
NSN 6610-01-230-9971
NSN 5905-01-521-3839
NSN 6650-00-241-0970
NSN 5990-01-030-5206
NSN 5945-01-113-9111
NSN 5945-01-641-9241
NSN 6220-01-314-4677