Collecting Wild Rice
One holds a very long paddle, probably used for poling in the shallows, while the others use tools to beat grains of rice from their stalks. The grip is also a simple flattened taper, more evidence that this style of grip seems to be commonly used in the past and forgotten by today's manufacturers.
Apparently, the image was originally painted by Seth Eastman in 1857 and originally titled, Chippewa Women Gathering Wild Rice. Found a link to one watercolour version here...
Chippewa Women Gathering Wild Rice, c 1857