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 5855-00-560-0110
NSN 6145-01-530-7171
NSN 5835-00-233-6327
NSN 6220-01-558-6496
NSN 5999-01-568-7947
NSN 5915-01-266-6671
NSN 5855-00-904-9572
NSN 6105-01-400-0895
NSN 5998-01-474-0809
NSN 5990-01-416-6009
NSN 6130-00-234-8710
NSN 4140-01-363-3861