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 5930-01-201-5739
NSN 5895-01-433-4072
NSN 6620-00-531-2974
NSN 5950-00-236-9875
NSN 5990-00-116-6590
NSN 2925-01-642-3255
NSN 5925-01-368-3723
NSN 5998-00-194-7208
NSN 5905-01-413-6362
NSN 5925-01-440-9364
NSN 6650-01-160-5058
NSN 6240-01-325-8901