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 6135-01-394-8087
NSN 5950-00-067-0418
NSN 5998-01-341-2732
NSN 6610-00-488-3780
NSN 6685-00-481-3666
NSN 5975-01-016-9493
NSN 4140-00-296-9695
NSN 5920-01-379-5657
NSN 6220-01-396-9520
NSN 6145-00-774-4579
NSN 6685-01-132-9681
NSN 5950-00-896-5788