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 6110-01-231-8683
NSN 6150-01-035-6513
NSN 6645-00-518-2068
NSN 6145-01-634-0388
NSN 6320-01-522-0318
NSN 5996-01-539-1351
NSN 6610-01-225-4997
NSN 5910-00-581-9843
NSN 6145-01-352-6913
NSN 5996-00-776-4665
NSN 6685-01-276-8200
NSN 6130-00-186-8460