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A method of forming a hollow shaft of rackeet comprises the steps of using water soluble PVA(PLOY VINYLL ALCOHOL) film to form a expansion core tube, placing the core tube in a mould to form the hollow shaft, putting water into hollow shaft to meld the PVA core tube then remove it.
TW82104694A1993-06-121993-06-12A method of forming a hollow shaft of racket
TW218371B
(en)