Heavy cast copper axes were stock-in-trade, and many smaller objects were turned out in quantity.
Ms Warren objects to trade deals being negotiated "in secret", and is especially suspicious of a dispute-resolution mechanism in recent trade pacts that allows companies to sue foreign governments for enacting discriminatory regulations.
Some of the most impressive objects in the collection are trade-union banners, hung in double-height galleries to show off their sometimes epic scale.
Objects and artifacts have long been Professor Turkle's stock in trade.
Romney also discussed Russia (whose support of Iran and Syria he strongly objects to) and China (which he feels is playing unfairly in trade with the United States).
Besides waving placards, they plan to trade art for objects in kind, even tickets for the fair itself.
The Winterthur Museum in Wilmington, Del., has brought out about 20 newly identified pieces in "Made for the Trade: Native American Objects in the Winterthur Collection".
"I've been gathering a stock of material for many years now, through secondhand trade, collecting abandoned objects in the streets [and] scrap-iron merchants," he says.
In many cases, models lack explicit attributes of 3D objects that make it possible to perform an automated query of these objects by trade type.
"They are responsible for virtually all of the things that any museum has, in terms of objects from the trade center," said Mark A. Schaming, curator of exhibitions for the New York State Museum in Albany.
