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 5975-00-293-8166
NSN 6150-01-431-8617
NSN 6685-00-598-1944
NSN 5965-00-893-6602
NSN 5910-01-391-7180
NSN 6150-00-244-5044
NSN 6610-00-248-1559
NSN 6110-00-542-2202
NSN 5915-01-449-5807
NSN 6130-01-480-2829
NSN 4140-01-150-9209
NSN 5999-00-161-8897