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 7035-00-126-1899
NSN 7035-01-155-0153
NSN 5945-01-024-9378
NSN 6620-01-287-1443
NSN 5996-01-538-4658
NSN 6150-00-093-5783
NSN 6145-01-659-5994
NSN 6145-01-474-6566
NSN 6685-01-340-1970
NSN 5998-00-122-1510
NSN 5996-01-314-9048
NSN 6620-01-337-8308