Assertion: guitar's design | /r/CapableOf | reverse its direction
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text: Since National had applied for a patent on an inward-facing single cone (U.S. Patent 1,808,756), Dopyera developed a design that reversed its direction: Rather than having the guitar's bridge rest on the apex of the cone as the National design did, it rested on an eight legged cast aluminum spider sitting on the perimeter of the cone (U.S. Patent 1,896,484).