Kun Nan Lo, Wu Hsiang Chung, Hsueh Cheng Liao: Composite-metal golf club head. Pro Kennex, Brown Martin Haller & McClain, April 29, 1997: US05624331 (282 worldwide citation)

A composite-metal wood-style golf club head having a metal casing with at least two openings in the crown in which composite covers are disposed. The portion of the metal casing between the covers defines a bar-like stiffener that extends between the face and the back in a direction generally perpen ...