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 5895-00-876-6855
NSN 6610-00-794-1719
NSN 5925-01-151-5137
NSN 5998-01-032-3608
NSN 2925-01-146-0278
NSN 5925-00-167-0592
NSN 5895-00-175-4168
NSN 6620-00-379-2856
NSN 5910-01-230-0713
NSN 6130-01-181-5475
NSN 5920-01-136-4010
NSN 5905-00-332-9330