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 6685-00-960-7667
NSN 6610-00-225-9886
NSN 6620-01-218-6203
NSN 5920-01-515-2163
NSN 5998-00-252-2676
NSN 6240-01-084-0944
NSN 7035-01-333-9298
NSN 6685-01-460-9550
NSN 6110-01-417-3545
NSN 4140-00-332-5956
NSN 6650-01-574-7646
NSN 2925-01-076-6128