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 6145-01-643-5536
NSN 6685-01-014-5983
NSN 5960-01-025-9388
NSN 5910-01-624-3583
NSN 5945-00-913-9395
NSN 5990-01-452-0911
NSN 5895-01-107-5994
NSN 5915-01-398-9831
NSN 5945-01-501-4213
NSN 5960-01-305-5449
NSN 5990-01-376-8930
NSN 6685-01-043-0182