1. On Pratt's contribution and the Columbia exposition: Adie, Allan D. "75 years of honest endeavor." Dyno-mite, December 1943, see p. 19.
2. McCoy's self-opening brace jaws were awarded United States Letters Patent no. 421,420; his three-jaw drill chuck, no. 568,539; his angular bit stock, no. 586,053.
3. The Rogers auger handle was awarded United States Letters Patent no. 484,050; Pratt's ratcheting auger handle, no. 438,860. The patent numbers for the other two auger handles have not been determined.