. . . "Although the invention is particularly concerned with the combination of a certain type of edge banding with a variety of types of fire door cores, one example of a core useable in the manufacture of the fire doors contemplated according to this invention is disclosed in the U.S. Pat. No. 4,159,302 of Dale R. Greve and Turner W. Richards, issued June 26, 1979, and also in the U.S. Pat. No. 4,343,1" .