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We use a current-current model for weak interactions to show that the weak-interaction contribution to the ground state energies of typical nuclei is about a part in 10^8 of their rest masses. By comparing this contribution with the results of the recent versions of the E\"otv\"os experiments, we conclude that weak-interaction energies obey the principle of equivalence to better than a part in 100, thus refuting claims that those experiments did not test weak-interaction effects.
Haugan et al. (Mon,) studied this question.