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 5975-01-634-0678
NSN 5835-01-079-3658
NSN 5855-00-014-5008
NSN 6320-01-029-4220
NSN 6610-01-575-8795
NSN 6145-01-483-1905
NSN 5965-00-153-5216
NSN 6105-01-518-3785
NSN 5915-01-032-6552
NSN 5975-01-339-1380
NSN 6610-01-422-1322
NSN 5835-00-711-3371