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 2925-01-043-9786
NSN 6645-00-445-8143
NSN 6110-01-582-6793
NSN 5905-00-919-7032
NSN 6685-00-528-5175
NSN 6220-00-113-8617
NSN 5996-01-454-6938
NSN 5998-00-369-6582
NSN 5985-01-516-0733
NSN 6650-00-273-8732
NSN 5905-01-137-3664
NSN 5965-01-538-8795