decis februari aggreg insur period complet occup applic articl regul eec administr commiss european commun social secur migrant worker regard articl regul eec made respons deal administr question aris provis regul eec no decis publish offici journal european commun march render unvalid entri forc regul eec no take account provis regul ground adopt decis case investig carri ascertain occup involv applic articl sentenc regul eec articl regul eec stipul case legisl member state make award benefit condit complet insur period specif occup insur period aggreg complet employ legisl member state employ insur period complet legisl member state receiv special treatment legisl state consequ defin legisl advis interest insur person institut undertak determin entitl prolong procedur investig employ instanc underground work mine defin legisl member state insur period complet work legisl regard insur period complet underground work mine relat legisl member state aggreg elig benefit award made condit insur period complet work carri investig decid view accept elig benefit award condit legisl member state insur period complet specif employ insur period complet employ legisl member state aggreg determin legisl state investig carri employ defin legisl decis publish offici journal european commun appli founder member state octob accord treati access april member state presid administr commiss doni