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 6645-00-353-6659
NSN 6145-01-269-9289
NSN 5895-00-396-3162
NSN 6610-00-511-2827
NSN 5996-01-213-5184
NSN 5998-01-459-7920
NSN 6150-01-282-2788
NSN 6130-00-683-1011
NSN 6610-01-341-4014
NSN 5945-00-356-6471
NSN 6130-01-370-4151
NSN 5950-01-136-0847