I grew up in Hazlet, and it's unbelievable how close the airmarine came to being as big as boeing. The web site you referenced tells all the firsts they had right in little Keyport. If they had hung around a few more years til the government started subsidizing the air mail I'm sure they be a major player.

I grew up (1944-57) in Union Beach, New Jersey on the Raritan Bay. Adjacent to Union Beach is the town of Keyport. There was a cluster of factory buildings in Keyport that called Airomarine. In my time it was a variety of manufacturing operations. There was a railroad spur to it. This aircraft may have been built there. Here are some links I Googled:
http://www.aerofiles.com/_aeromar.html
http://en.wikipedia.org/wiki/Aeromarine_40
Harry