Greenfield Tap & Die Co.Clawson, Chris2020-06-212020-06-21April 7 20https://dspace.montaguearchive.org/handle/MHS-01376/37852/25/48 GTD at Symmons Engr. Plant Boston Mass.;Editor's Note: A lathe - mounted metal component is being "tapped" (threaded) for a mating component.