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 5996-01-616-4662
NSN 6135-01-219-8612
NSN 6320-00-004-9158
NSN 6320-01-428-9205
NSN 5905-00-337-6467
NSN 6220-01-539-6598
NSN 5996-00-688-9082
NSN 5930-01-655-8408
NSN 6130-00-246-8691
NSN 5950-01-391-7522
NSN 4140-01-531-7375
NSN 5920-01-597-9628