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 5999-01-401-5322
NSN 6135-00-100-8890
NSN 6610-01-055-0468
NSN 6650-01-436-3478
NSN 2925-00-351-1015
NSN 5960-01-541-9884
NSN 6620-00-698-6700
NSN 6610-01-655-7644
NSN 5999-00-235-5411
NSN 5985-01-360-7467
NSN 7035-01-398-9581
NSN 5905-00-946-0098