commiss decis decemb possibl afford coal undertak postpon payment levi due ecsc commiss european commun regard treati establish european coal steel commun articl thereof result difficulti market coal undertak experienc except pile stock hard coal coke deriv hard coal hard coal briquett coal field commun accord principl embodi articl decis determin mode assess collect levi amend decis undertak concern enabl obtain tonnag stock postpon payment levi due good withdrawn stock implement system undertak requir declar tonnag stock undertak grant postpon payment stop furnish inform state stock consid withdrawn stock tonnag involv normal stock evalu chargeabl monthli product postpon payment levi appli stock excess percentag monthli product quantiti withdrawn stock deduct order stock quantiti postpon payment grant refer price list forc time entri stock adopt decis articl notic coal undertak mai applic postpon payment levi chargeabl product stock decemb quantiti stock exce chargeabl monthli product determin quantiti stock hard coal hard coal briquett schlamm consider coke deriv hard coal convert hard coal equival ratio payment postpon interest collect due date articl payment levi quantiti withdrawn stock fall due dai month continu long postpon payment respect quantiti stock remain due articl applic postpon payment levi product stock decemb reach levi offic dai month preced month start februari applic state quantiti stock dai preced month quantiti stock dai month preced month amount respect applic postpon payment made deduct undertak amount levi due dai month oj articl long payment amount levi due postpon pursuanc decis undertak dai month declar levi offic quantiti stock dai preced month declar commiss good involv withdrawn stock mean articl articl penalti provid paragraph articl treati impos case fals declar articl decis enter forc januari decis bind entireti directli applic member state brussel decemb commiss presid mansholt