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 5835-01-658-4437
NSN 7035-01-481-8247
NSN 5930-01-185-5823
NSN 6145-00-530-8427
NSN 7035-01-374-0005
NSN 5835-01-091-8353
NSN 6240-00-287-1988
NSN 6145-01-152-3534
NSN 6320-01-585-8468
NSN 5930-01-293-9984
NSN 5915-01-045-4135
NSN 4140-00-394-8731