Plastic pellet hoppers 1950s+

I'm curious to know what type of hoppers were used for plastic pellet service in the mid to late 1950s. Any information would be appreciated.

Check out this link:

http://luetzowind.com/aHistory.html" onclick="window.open(this.href);return false;

Looks like a small cube GATX airslide.

http://www.gatx.com/wps/wcm/connect/GAT ... ic+Pellet/" onclick="window.open(this.href);return false;

Thanks for the help, I had air slide hoppers in mind

Airslide hoppers ..various types..various roads

http://home.mindspring.com/~icg/pics/ga04proto.jpg" onclick="window.open(this.href);return false;
http://www.trainweb.org/bobx/Tr-Frt-Airslide.jpg" onclick="window.open(this.href);return false;
http://www.trainweb.org/chessie/bo857025b.jpg" onclick="window.open(this.href);return false;
http://home.mindspring.com/~paducah/ga01.htm" onclick="window.open(this.href);return false;
http://home.mindspring.com/~icg/pics/ga05proto.jpg" onclick="window.open(this.href);return false;

Thanks for the links carter b