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 5930-01-104-3984
NSN 6650-00-910-2708
NSN 5905-01-634-0595
NSN 5985-01-146-5679
NSN 5950-00-803-5641
NSN 2925-00-081-3547
NSN 6240-01-006-4216
NSN 5996-00-398-9653
NSN 5920-01-568-7054
NSN 5915-00-911-6422
NSN 5996-00-580-4129
NSN 2925-00-338-4667