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 6610-01-578-9444
NSN 5915-01-129-9710
NSN 6145-01-577-5594
NSN 5905-01-314-3919
NSN 5915-01-181-0053
NSN 5910-01-359-1966
NSN 4140-01-328-1065
NSN 6130-00-038-8274
NSN 6320-01-171-3238
NSN 6105-00-281-8185
NSN 6650-00-724-8258
NSN 6135-01-142-2417