Baseball apparatus. Patent number: 475432 Issue date: May 24, 189

“The object of the invention is to relieve the right arm. It may be used by all the players, but more especially by the pitcher. It provides an elastic tension on the lower part of the arm. The severe work imposed on the right arm in pitching induces lameness in the commencement of a season and tends to induce permanent deformity, the right arm of some baseball players being found to measure considerably longer than the left.