Nameplate from an old steam powered railway crane located in Mount Savage, Maryland. I was told that only five of these were built - all for the military
He in fact was the proprietor of Phoenix Antiques downtown, and from what Dope He went on to further state that during WWII, the Brownhoist built cranes
Generally these plaques would be found on a crane car by the company that 1930 Industrial Brownhoist Corp railroad crane brass builder plate USA 17"x12".