Flex-C Trac, Flex-C Plate, Flex-C Angle - US 6000181, 6625942, 6637173, Canada 2330125, New Zealand 507672, Australia 760162, Europe 1073805, China ZL01815011.X and other patents pending. Hammer Lock - US Patent 8,453,403. Canadian Patent for Hammer-Lock feature - 2656542. Flex-C Header - US Patent 7,210,271. Three Legged Dog - US patent 6792733 and other patents pending. Quick Qurve Plate - patent pending. Registered Trademarks: Flex-C Trac in the US, Australia, New Zealand, Canada and Europe. Three Legged Dog in the US and Canada, Quick Qurve in the US and The Curved Wall People in the US.