It appears that the boys are making LH & RH props, maybe. Like the Canadian Propeller Works (CPW).
I'm thinking that the boys (couldn't be the Wrights?) bandsawed out the laminations, and made the little blocks to index the laminations one to another, not clamping them (?). The blocks would probably have been made on a table saw. Looks like the guy on the right is knocking the blocks off, while the guy on the left is planing the laminations into a RevUp.

Steve