"Oil Tempered" is term used for the process of hardening or preserving the wood on Baseball bats. Bone Rubbed appears on bats made in the 1920's. The "Powerized" process was first used, and patented by the Hillerich & Bradsby Co. in 1931, and Powerized and Bone Rubbed" logo is used during the 1932 season.
In 1933 and 1934 the bats were stamped "Powerized and Oil Tempered" which usually is a very light heat foil type print. This is the last two years the term "Oil Tempered" was used. For more information on Louisville Slugger bat dating see Related Links below.
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