1
John Zebelean: Metal golf driver and method of making same. Pro Patterns, Freilich Hornbaker Wasserman Rosen & Fernandez, July 29, 1980: US04214754 (326 worldwide citation)

An all metal hollow golf driver is formed by casting a first main part from metal, e.g., stainless steel, in the shape of practically a complete golf driver, except for an opening in one side of the driver body, e.g, the sole side. A second cast part fits within the opening and is weldable thereto t ...


2
John Zebelean: Metal golf driver. Pro Pattern, Harris Kern Wallen & Tinsley, February 21, 1984: US04432549 (267 worldwide citation)

An all metal hollow golf driver is formed by casting a first main part from metal, e.g., stainless steel, in the shape of practically a complete golf driver, except for an opening on one side of the driver body, e.g., the sole side. A second cast part fits within the opening and is weldable thereto ...