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 6220-00-296-4101
NSN 5950-00-058-6392
NSN 5910-01-597-5475
NSN 5996-01-573-8829
NSN 6145-01-178-8824
NSN 5945-01-640-9489
NSN 6685-01-116-1603
NSN 5945-00-344-9615
NSN 6240-01-194-2206
NSN 6145-01-535-6220
NSN 5835-01-116-2369
NSN 4140-00-948-0355