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 5935-01-562-6293
NSN 5965-01-207-0991
NSN 5975-00-801-7411
NSN 5998-01-351-6135
NSN 5925-00-217-6381
NSN 5925-01-510-8584
NSN 5998-00-754-8666
NSN 5935-00-246-8915
NSN 5925-01-573-6136
NSN 5998-01-192-0673
NSN 5996-01-123-9038
NSN 6610-01-414-1755