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 5895-01-275-7584
NSN 6610-01-425-1523
NSN 7035-01-200-4751
NSN 4140-00-871-3000
NSN 5998-01-377-4316
NSN 5915-00-449-4488
NSN 6620-00-104-6937
NSN 5975-01-244-3514
NSN 5905-00-136-1916
NSN 5835-01-618-7621
NSN 5930-01-571-8762
NSN 6105-01-103-4498