Federal agents conducted raids on establishments containing coin-operated gambling devices which don't carry $250 federal tax stamps. Such machines were located in Tamaqua and Coaldale, along with 10 other Schuylkill County communities. The agents uncovered 97 machines, with value of missing tax stamps totaling $24,250. Machine owners were ordered to report to the Pottsville office of the Internal Revenue Department to get the stamps or make settlement.