These stocks have a long history of increasing dividends.When a company earns a profit, it can pay a portion to shareholders as dividends. That's a nice reward for shareholders, providing regular income. However, it's still important to pick strong companies that cannot only maintain dividends but increase them regularly through higher earnings and cash flow.These three stocks fit the bill. Two of them are Dividend Kings, an illustrious group of companies that have raised dividends for at least 50 straight ...