The step-edge fount is just one of the changes done between 1915 and 1920 and illustrated by these two HY-LO's. To pin down the sequence and date of each change will require us to find each of the versions that exist in-between. For example, there should be a version prior to this plain-tube that has the Y wires and older, separate, staple guide and thumb loop. Subsequent to this plain-tube will be versions that add the vertical tube reinforcing and the step-edge fount and the spiral wire burner (1920-1921), etc.
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