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 5835-00-128-1967
NSN 6240-01-054-7185
NSN 6685-01-398-1097
NSN 6130-01-409-1443
NSN 6320-00-082-5868
NSN 5915-00-756-2699
NSN 5930-00-251-9327
NSN 5895-01-584-8662
NSN 5930-01-239-3231
NSN 6320-00-405-2348
NSN 5835-00-856-6744
NSN 5895-01-423-7268