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 5945-00-655-4444
NSN 6135-00-231-7257
NSN 7035-01-449-1846
NSN 5895-01-447-7857
NSN 5998-00-248-6943
NSN 6135-01-190-2628
NSN 6685-01-383-1919
NSN 5930-01-417-8734
NSN 6320-00-994-0179
NSN 5910-01-542-3297
NSN 5910-01-454-9833
NSN 6620-00-241-2165