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 6645-01-552-4570
NSN 4140-01-124-8549
NSN 5930-01-464-5305
NSN 5855-01-579-7065
NSN 5915-01-101-3943
NSN 6105-01-448-6319
NSN 6685-00-230-4267
NSN 4140-01-243-5817
NSN 6220-00-473-0517
NSN 6130-01-078-3802
NSN 6220-01-015-0109
NSN 5996-01-285-6389