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 6650-00-137-3845
NSN 6645-01-545-2954
NSN 6145-01-223-9887
NSN 6620-00-506-0112
NSN 5985-01-218-2924
NSN 5925-00-553-2274
NSN 5998-01-379-7241
NSN 6105-01-326-7345
NSN 5855-01-578-6742
NSN 6220-00-480-9172
NSN 5945-01-645-5151
NSN 5930-00-661-2280