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 6610-00-827-8959
NSN 2925-00-656-3224
NSN 5975-00-937-8749
NSN 6145-01-094-6108
NSN 6610-00-809-0644
NSN 5920-01-610-3494
NSN 5835-00-256-5558
NSN 5905-00-464-4957
NSN 5950-01-281-2763
NSN 5905-00-216-6576
NSN 6145-01-428-9932
NSN 5990-00-055-1956