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 5998-01-361-8822
NSN 4140-01-037-6270
NSN 6220-01-656-3925
NSN 5996-01-583-2078
NSN 6130-01-327-2400
NSN 5910-00-724-0068
NSN 6145-01-197-1619
NSN 5999-01-340-7433
NSN 6685-01-179-3099
NSN 7035-01-268-5732
NSN 5998-00-617-6239
NSN 5835-01-281-1655