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 5960-01-038-8487
NSN 2925-00-707-6770
NSN 5915-01-211-1948
NSN 5910-01-087-2614
NSN 5975-01-213-7884
NSN 5950-00-596-2693
NSN 6220-01-407-8140
NSN 6240-01-191-5643
NSN 2925-01-123-5856
NSN 6320-01-436-0513
NSN 6220-00-547-8807
NSN 5975-00-089-7694