(') Antal arbejdstimer udfort af minearbejdere og ansatte i entreprenørvirksomheder, som henhører under minearbejdernes sociale slkringsprogram. ( > ) Inklusive komplikationer.
(') Number of hours worked by pit staff and employees of contractor firms who belong to a miner's social Insurance scheme. (') Including complications. (*} The shoulders and the wrists are Included under 'upper limbs'.