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 6620-01-276-7057
NSN 5960-00-764-5927
NSN 6220-01-476-9371
NSN 6620-01-419-3524
NSN 5960-00-245-2645
NSN 5985-01-382-8281
NSN 6150-01-490-1318
NSN 5985-01-416-3942
NSN 6220-00-136-0138
NSN 7035-01-101-5111
NSN 5905-01-585-3540
NSN 6150-01-424-0996