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 6220-01-480-4000
NSN 5996-00-239-6402
NSN 6620-01-486-8002
NSN 4140-00-099-9205
NSN 6220-01-368-9107
NSN 5985-00-737-0494
NSN 2925-00-808-5077
NSN 5950-01-475-2288
NSN 5985-01-313-7839
NSN 6650-00-272-2271
NSN 5998-01-152-1221
NSN 6685-00-410-4972