Official Gazette of the United States Patent and Trademark Office:

Official Gazette of the United States Patent and Trademark Office: tonneau cover with t slot T-Slot systems on retractable truck bed covers, such as Retrax and Roll-n-Lock Is the tonneau cover with t slot Don't buy a Retractable Tonneau Cover until You see This! Retrax Pro XR Tonneau Cover 2

tonneau cover with t slot Link to purchase American Roll Cover truck-covers-usatruck

slot machine play for free Designed to work with tonneau covers equipped with a T-slot: UltraGroove & Retrax XR Channel Rails, but works with any T-slot tonneau covers! Universal and RetraxPRO XR Tonneau Cover Highlights: Supports up to 500 lbs evenly distributed Compatible with most T-slot accessories from Rhino Rack, Yakima, Thule,