I posted about the Sinclair exhibit at the 1964 Worlds Fair a while ago, and I just came across the photos of those dinosaurs getting made in Hudson New York by Paul Jonas

I posted the article on the 1964 World's Fair exhibit in 2016 http://justacarguy.blogspot.com/2016/02/that-cool-old-dinosaur-mascot-great.html

https://photobygibson.com/archive/