Clawson, Chris2020-04-132020-04-13https://dspace.montaguearchive.org/handle/MHS-01376/9475 step tandem tap 3.2187 x 2.9687 x 2.781 x 1.468 x 1.218- 32 uns for American Cytoscope Makers Inc. Made in Feb., 1958Greenfield Tap & Die Co.GTD