[HAND-BUILT MACHINE MODEL]. Wooden Model for a ?Pile-Driver"- Like Machine. [Ca. 20th century]. Wooden model with metal cogs, handles, weight, and twine. Moving parts which raise metal weight when the crank is turned, similar to a ?pile driver" construction machine. 17 x 6 x 21 ?". Some soiling, wear, scuffing. Very good. It is unclear if this is a patent model or not (no labels or paperwork are present).