Clawson, Chris2020-04-132020-04-13https://dspace.montaguearchive.org/handle/MHS-01376/9212/25/48 GTD at Symmons Engr. Plant Boston Mass.; <br /> Editor's Note: A lathe-mounted metal component is being "tapped" (threaded) for a mating component.Greenfield Tap & Die Co.GTD