[Butch7999]

US Patent 716,541, "Bat," patent granted to John A Hillerich of Louisville Kentucky, 23 December 1902.

"...My invention relates to improvements in base-ball bats and in the process or method of producing the same, and has for its objects
to harden the surface of the bat and promote its ball-driving quality, while the full elasticity of the wood in the body of the bat is preserved;
also, to preserve the bat from checking, chipping, or splintering on its surface from exposure to the sun or weather; also, to improve the finish
and appearance of the bat by the same means which increases its above-mentioned useful qualities.

"...my invention, relating more particularly to the surfacing of the bat, is not dependent on the solidity or integral character of the same,
but may be applied in bats of sectional or hollow construction. After the bat... has been turned to the desired form the surface of the
driving part... is hardened, smoothed, and finished at the same time by the application of friction and heat... "

Welcome to the board, Thomas!