(225 ILCS 710/45.48)
(from Ch. 96 1/2, par. 4301)
If hoisting be done from greater depth than 100 feet by means of a bucket, shaft doors shall be constructed that will prevent any material
from falling into the shaft while the bucket is being dumped, and such
doors shall be closed while the bucket is being dumped.
(Source: Laws 1945, p. 1035.)