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 5960-01-632-6576
NSN 5915-00-659-2337
NSN 7035-00-803-3056
NSN 6110-01-426-6924
NSN 2925-01-078-7854
NSN 5925-01-634-0664
NSN 6650-01-383-4526
NSN 5895-00-408-5044
NSN 6145-01-634-0388
NSN 5910-00-812-5047
NSN 5950-01-196-6920
NSN 5990-01-243-4233