That big Crown wagon replaced the Duplex wagon. Here's some info on the Duplex pumps:
http://www.lafra.org/grapevine/section/a...uplex-rigs
I think the concept of the Crown was the same as the Duplex rigs.
http://www.lafra.org/grapevine/section/a...uplex-rigs
I think the concept of the Crown was the same as the Duplex rigs.