Ringsby Truck Lines
Denver, CO
MC-052709 DoT 44852
Shut down 1984
Facebook - Ringsby Freight System
Route Map - 1961
Profiled in Mike Terebecki's The Vanishing Trucking Pioneers Book (click image to see Book index)
Acquisitions
Patches of it that are in my project - Facebook Trucking Industry Insignia Patches
Other known patches
If you want your own memoribilia:
Items available on eBay
Note that patches sold by "freedomfifty2k" and "bob82ndabn325inf"are likely promo/replica patches, not patches actually used by the company represented.