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 6135-01-388-2581
NSN 5835-01-201-1000
NSN 5965-01-005-0611
NSN 6645-00-664-4665
NSN 6150-00-383-7883
NSN 5895-00-054-0732
NSN 2925-01-497-9381
NSN 5985-01-086-3358
NSN 6650-00-654-6950
NSN 6130-01-029-5470
NSN 5905-01-482-1779
NSN 5985-01-648-6083