Cushioned wood cores were patented in the late 19th century by sports equipment manufacturer Spalding, the company founded by former baseball star A.G. Spalding.
Jezgre s uloženim drvetom je patentirao, krajem 19. stoljeća, proizvođač sportske opreme Spalding, tvrtka koju je osnovala bivša bejzbolska zvijezda A. G. Spalding.