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 6650-01-123-3110
NSN 5965-01-023-0809
NSN 5915-01-193-6298
NSN 5835-00-807-5632
NSN 5895-01-484-8977
NSN 5920-01-153-2690
NSN 5920-00-987-1605
NSN 6685-00-317-4319
NSN 4140-01-454-7119
NSN 5999-01-322-4906
NSN 5905-01-305-3779
NSN 5925-01-160-7609