We use the concept of dual Goldie dimension and a characterization of
semi-local rings due to Camps and Dicks (1993) to find some classes of
modules with semi-local endomorphism ring. We deduce that Linearly co
mpact modules have semi-local endomorphism ring, cancel from direct su
ms and satisfy the n th root uniqueness property. We also deduce that
modules over commutative rings satisfying AB5 also cancel from direct
sums and satisfy the n th root uniqueness property.