In 1885 Fredrick Wells applied for a patent on a new and improved die-stock and the next year he and his brother left their employer Wiley and Russell Manufacturing to make and sell thread cutting tools. The Greenfield Mass. company did well, eventually also including drills and drilling machines in their lineup.
In 1912 they were acquired by Greenfield Tap and Die and the product line streamlined back to threadcutting tools. More history here at Vintagemchinery.com
Meanwhile in Canada, in 1914 the Well Brothers Canadian branch bought out Canadian Tap and Die, based in Galt Ontario. Was the Canadian branch an independent company or had it been included in the sale to the Greenfield Tap and Die?