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 5996-01-461-8897
NSN 5985-01-032-0127
NSN 6145-00-937-8895
NSN 6130-01-231-1561
NSN 6645-01-246-2725
NSN 5945-01-659-5781
NSN 5998-01-330-7555
NSN 6150-01-562-2362
NSN 6650-00-084-4258
NSN 6150-01-634-0575
NSN 6650-01-372-8931
NSN 4140-00-289-9263