I've been checking out vintage travel trailer info and was reading this ebay listing. Going thru the pictures it has a frame patent sheet, it's the last picture in the listing. Frame patent by Robert Barth!

http://cgi.ebay.com/ebaymotors...29QQptZRVsQ5fCampers

Have Fun,
Wm.

Streamline was right up there with Airstream, Silver Streak, Boles Aero, & Barth, in quality, & was contemporary with all of them. I never saw the name associated with Airstream, or Duke until this ad.

I think Duke is the Streamline model. Here's the tincantourists mfg info page for Streamline.

http://www.tincantourists.com/...ku.php?id=streamline

It seems the Streamline owners came from Airstream, then Streamline went on to become Newell. I wonder how many other companies used Barth patents?

Have Fun,
Wm.