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 5935-01-442-6303
NSN 4140-00-922-8875
NSN 5950-00-584-4571
NSN 4140-01-295-8264
NSN 5920-00-862-5820
NSN 5925-00-981-5309
NSN 6145-01-409-1034
NSN 5915-00-350-3430
NSN 5855-00-055-1579
NSN 5905-01-357-4426
NSN 5835-01-238-3381
NSN 5998-01-505-0830