 Sanadkii 1920-kii,waxaa hogaamiyihii ugu horeeyay ee maamula ururka shaqaalaha dunida ILO loo doortay Frances Albert Thomas waxaana labadii sano ee u horeysaay xubno ka noqday 16 urur weyne halka 18-urur oo kale ay codsadeen in ay ku soo biiraan 