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 5945-01-521-0916
NSN 5935-01-111-3173
NSN 5999-00-248-7240
NSN 6320-01-607-0347
NSN 5965-00-452-0967
NSN 6645-00-038-7737
NSN 5915-01-396-6955
NSN 7035-01-512-1826
NSN 5910-01-386-3997
NSN 6645-00-241-3280
NSN 5998-01-207-0088
NSN 5915-00-040-9073