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 6650-00-098-6128
NSN 6650-01-369-6536
NSN 6135-00-900-2139
NSN 5855-00-832-9341
NSN 6685-01-327-3286
NSN 5835-01-515-6537
NSN 5998-01-158-5544
NSN 5985-01-652-2148
NSN 5915-00-985-3810
NSN 6610-01-514-7755
NSN 6105-01-341-6142
NSN 6685-01-508-0494