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 6130-01-139-7401
NSN 6145-01-308-4878
NSN 6220-01-181-3135
NSN 5975-01-377-6365
NSN 5965-01-418-7226
NSN 5965-01-032-0940
NSN 6240-00-935-7058
NSN 5905-00-014-0596
NSN 6220-01-437-8089
NSN 5935-00-427-4414
NSN 6610-01-212-9817
NSN 5915-01-540-9757