Gang,
A member on the GG reported that Irwin also sold drivers that matched "Champion Screwdrivers". So here's my best guess on what happened:
Between 1879 and 1899, the owners of Patent 214,785, sold nonexclusive rights to their design to any manufacturer who was willing to pay their fee.
After 1899 when patent protection expired, all interested parties had free rights to this design and produced drivers of this design for decades, perhaps even for a century.
Starting sometime around the 1940's, when plastic handled drivers were growing in popularity, wood handled screwdrivers of all designs began their fade into the sunset.