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 6135-01-014-9755
NSN 5945-01-373-1554
NSN 4140-01-650-1208
NSN 5985-01-516-1588
NSN 5985-00-211-2507
NSN 6650-01-169-6367
NSN 5925-01-431-8886
NSN 5915-00-799-2975
NSN 7035-01-287-7781
NSN 5835-01-250-2939
NSN 5925-01-433-2535
NSN 6220-01-447-1993