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 5905-00-038-6961
NSN 5905-01-014-5472
NSN 5990-01-546-1649
NSN 6620-01-591-1331
NSN 6150-01-400-4211
NSN 5945-01-602-0563
NSN 6145-01-451-4304
NSN 6685-01-503-1679
NSN 5915-01-198-2074
NSN 6650-00-527-8822
NSN 5935-01-335-0239
NSN 5990-00-660-8885