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 6105-01-239-7626
NSN 6610-01-217-4162
NSN 5935-00-584-4047
NSN 5990-01-254-2936
NSN 4140-01-030-4122
NSN 5999-01-480-1824
NSN 6685-01-071-0982
NSN 6320-01-616-0843
NSN 5990-00-840-6571
NSN 5945-01-481-0036
NSN 5950-00-960-7383
NSN 5975-01-585-9096