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 6620-01-216-0904
NSN 5945-01-254-1729
NSN 6240-00-218-1480
NSN 5960-01-530-8828
NSN 5895-01-003-4596
NSN 6130-01-180-9727
NSN 4140-00-757-5270
NSN 6650-01-602-7567
NSN 6220-01-443-0719
NSN 5935-01-375-3616
NSN 5975-01-660-0433
NSN 6130-00-811-3799