Waterloo Mfg of Ontario – Canadian distributor of the Heider and Rock Island Tractor lines.

The following companies were closely tied to the Rock Island Plow Co with RIPC marketing their products either under the RIPC name or acting as partners with joint advertising that exceeded the normal jobber status.  

Jacob Haish Mfg – Gas engines and Great Western products

Alamo Mfg – Gas engines

Joliet Mfg – Corn Shellers

Peoria Drill & Seeder– grain drills and endgate seeders (in progress)