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 2925-00-656-3224
NSN 5855-01-228-0942
NSN 5855-01-540-6522
NSN 5996-00-494-3621
NSN 5835-01-508-2528
NSN 5998-01-474-5238
NSN 5996-01-531-6491
NSN 6620-01-485-0556
NSN 5915-00-755-4181
NSN 5835-00-443-1079
NSN 5990-00-155-2306
NSN 5835-00-905-7165