16 cfr 1500.49 July 8, 2019 16 32 64 128 16 cfr 1500.49 sharp edges 16 cfr 1500.49 pdf 16 cfr 1500 16 cfr 1500.91 16 cfr 1500.50 16 cfr 1500.17(a)(13) 16 cfr 1501.3