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 5990-00-104-1617
NSN 6110-01-276-7681
NSN 5998-01-180-8067
NSN 5920-01-458-9148
NSN 5935-01-012-2565
NSN 5985-01-106-1736
NSN 5895-00-510-9169
NSN 5895-01-199-5599
NSN 5998-01-548-8442
NSN 5910-00-869-1172
NSN 5920-00-498-5109
NSN 6110-00-136-9590