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 5920-01-384-2633
NSN 6240-00-991-6929
NSN 5915-01-010-3866
NSN 6105-00-189-0515
NSN 5975-01-293-0696
NSN 5905-01-487-8868
NSN 6145-00-905-7255
NSN 6105-00-196-4957
NSN 7035-01-218-4233
NSN 5930-00-783-6121
NSN 5985-01-321-7383
NSN 6130-00-266-7496