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 6320-01-578-6006
NSN 5975-01-294-3156
NSN 6685-01-062-8104
NSN 5985-00-581-6246
NSN 4140-01-541-4286
NSN 5950-01-576-9658
NSN 5920-00-773-1282
NSN 5895-00-625-5424
NSN 6320-00-937-5625
NSN 6220-01-435-6183
NSN 5895-01-416-4337
NSN 6105-01-071-1367