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 5950-01-307-4478
NSN 5930-00-463-8845
NSN 5945-00-606-2918
NSN 6145-01-304-0684
NSN 5965-00-100-1291
NSN 6620-01-369-5876
NSN 5960-00-816-9040
NSN 6620-00-819-5046
NSN 5985-01-589-2064
NSN 5945-01-370-4784
NSN 6685-00-936-9852
NSN 6105-01-548-6629