Shares of Caterpillar and 3M are trading higher Wednesday afternoon, lifting the Dow Jones Industrial Average into positive territory. Shares of Caterpillar and 3M are contributing around a quarter of the blue-chip gauge’s intraday rally, as the Dow was most recently trading 47 points higher (0.1%). Caterpillar’s shares have gained $8.73, or 3.6%, while those of 3M are up $3.73, or 3.5%, combining for a roughly 82-point boost for the Dow. Dow Intel and Salesforce are also contributing significantly to the gain. A $1 move in any one of the 30 components of the Dow equates to a 6.59-point swing.