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 7035-01-577-0003
NSN 5950-01-452-7197
NSN 6610-01-434-2044
NSN 6320-00-646-3311
NSN 5835-00-498-8189
NSN 5996-00-661-1151
NSN 6620-01-341-5164
NSN 5965-00-402-7799
NSN 5855-00-058-1293
NSN 5915-01-519-6675
NSN 5915-01-173-2904
NSN 6610-00-135-5815