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 5855-01-648-2674
NSN 5985-01-333-8253
NSN 5835-01-510-1873
NSN 6150-01-626-5208
NSN 6135-00-299-6918
NSN 6220-01-400-4203
NSN 5960-01-117-6577
NSN 5895-00-379-4699
NSN 6320-01-255-2096
NSN 6145-00-185-4515
NSN 5998-01-421-2773
NSN 4140-00-131-6486