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 5835-00-518-2740
NSN 6110-00-618-4171
NSN 5930-01-435-4399
NSN 5930-01-329-4013
NSN 5950-01-230-2258
NSN 6685-01-303-4673
NSN 5985-00-379-2345
NSN 6130-00-220-9655
NSN 6110-01-432-2248
NSN 6135-01-565-3284
NSN 6240-01-516-8393
NSN 5905-00-906-6360