Greenfield Tap Drill Chart with Decimal Equivalents

Greenfield Tap & Die Corp. of Greenfield, Massachusetts gave away these plastic cards in the 1960's to promote its business.  The cards measure 3.5" x 5.5" and are solid plastic.  A tap drill chart is on one side, and the reverse shows decimal equivalents.

This card is in excellent condition and would make a wonderful addition to a collection of machine tool memorabilia.

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