nacco industries on thursday said its board raised the quarterly dividend by 48 to 2175 cents from 2075 cents the new payout equal to 87 cents a year represents an annual yield of about 274 based on wednesdays closing price of 3175 up from 261 the dividend is payable to holders of the companys class a and class b common stock the cleveland supplier of coal to power generation companies said the increased dividend is payable june 15 to shareholders of record may 31