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  Helmholtz, Hermann_Ludwig_Ferdinand_von_Helmholtz, Hermann_von_Helmholtz   Baron_Hermann_Ludwig_Ferdinand_von_Helmholtz, Helmholtz, Hermann_Ludwig_Ferdinand_von_Helmholtz, Hermann_von_Helmholtz   Hermann_Ludwig_von_Helmholtz Hermann_von_Helmholtz Helmholtz, Hermann_Ludwig_Ferdinand_von_Helmholtz, Hermann_von_Helmholtz