Which preposition to use with laundrymen

of Occurrences 2%

Instead of paying the fine he appealed, backed up in his action by the other laundrymen of Portland, on the ground that the ten-hour law for women workers was unconstitutional.

for Occurrences 1%

He merely said, goaded to harshness, that he was not going to be a Chinese laundryman for any one.

in Occurrences 1%

Other streets, where there are no tracks, are sprinkled by coolies, who carry upon their backs pig skins and goat skins filled with water and squirt it upon the ground through one of the legs with a twist of the wrist as ingenious and effective as the method used by Chinese laundrymen in sprinkling clothes.

on Occurrences 1%

White men and girls had come into the trade about 1888, taking the place of the Chinese, who had been the first laundrymen on the West Coast.

Which preposition to use with  laundrymen