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 5985-01-183-2127
NSN 6320-00-422-9006
NSN 6105-01-160-9480
NSN 5975-01-468-8882
NSN 6150-00-116-7939
NSN 5925-00-655-4345
NSN 5960-01-641-5493
NSN 6650-00-226-7099
NSN 6150-01-360-3749
NSN 5930-01-413-8954
NSN 4140-01-056-6730
NSN 5998-01-359-3404