patent 2226673 was issued Dec. 31, 1940 yes, new years eve someone was working in
the patent office, how times have changed.
looking into the family history of St. Pierre Chain Co. Thomas St. Pierre does not show up.
it is possible that the hammer was made by one of the many co. in Worcester in that period.
St. Pierre Chain & Wire Mfg. Co. is still in bussiness at the same location. (over 80 years)
3rd generation of St. Pierre's are running it. 317 East Mountain St. Worcester, Mass.
they also are still making pitching horseshoes.