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 6610-01-364-0294
NSN 6645-01-229-9769
NSN 5998-01-478-9318
NSN 6240-01-623-3798
NSN 2925-01-400-2286
NSN 5915-00-847-7890
NSN 5835-01-257-0154
NSN 6145-01-484-8735
NSN 5920-01-152-1021
NSN 5985-01-157-0690
NSN 6105-01-163-2065
NSN 5990-01-462-1617