Abstract. We consider a PL involution of an orientable, 3-dimensional handlebody for which each component of the fixed point set is 2-dimensional. The handlebody is uniquely equivariantly decomposed as a disk sum of handlebodies Mi such that if M,■ = A¡ X /, then h | M¡ is equivalent to (i) a X id,, where a is an involution of A, or to (Ü) ida X r, where r(t) = -t for allí s / = [-1,1].
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