THE MECHANICAL BASEBALL PITCHER. CROSS SECTION OF THE BASEBALL GUN. THE BASEBALL CANNON. GUN FOR DELIVERING A CURVED BALL AS USED ON THE PRINCETON BALL GROUNDS., scientific american, 1897-06-26
THE MECHANICAL BASEBALL PITCHER. CROSS SECTION OF THE BASEBALL GUN. THE BASEBALL CANNON. GUN FOR DELIVERING A CURVED BALL AS USED ON THE PRINCETON BALL GROUNDS., scientific american, 1897-06-26
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