I don't know, although it would be possible. We researched what equipment other zoos had but information was pretty scanty, so we basically started from first principles based on lots of meetings with the keepers to find out what they needed. Then we had to figure out how strong it had to be, how to get the mechanisms to work, and how it could be operated simply and safely. We also looked at the fairly primitive setup they already had to work out some of the small details like inspection doors. You can't take chances when people need to work closely with elephants, so at the end of the day when it all seemed to work and the keepers said they liked it, we were pretty happy.
rgmwa