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 5930-00-443-6661
NSN 6130-00-224-2450
NSN 5930-01-644-7861
NSN 5905-01-220-9403
NSN 5935-01-270-5665
NSN 6105-00-320-0260
NSN 5855-00-189-6066
NSN 5960-01-481-3722
NSN 5945-01-157-9781
NSN 6105-01-202-9339
NSN 5996-00-333-5182
NSN 6110-01-623-7816