A total of 109 samples were taken on the operators themselves. In
such cases the sampling tube was attached to the person's clothes
near the breathing zone. The tube was connected to a pump at-
tached to the operator's belt. This type of sampling was carried out
on: mixer operators, operators of continuous vulcanisation lines
who have to move along the entire line, operators who continually
handle newly vulcanised rubber, forklift truck drivers who move
from workshop to workshop.