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 6650-00-641-6139
NSN 5855-00-151-3853
NSN 5945-01-432-9625
NSN 5835-01-116-2369
NSN 6145-00-171-3152
NSN 5895-01-032-0299
NSN 5905-01-226-0101
NSN 5975-01-065-2953
NSN 5925-01-068-2887
NSN 5895-01-538-3158
NSN 5930-01-279-1497
NSN 5835-01-130-8258