Long-term investors who like to hold stocks for decades need to pay extra attention to the companies they're buying. Focusing on stocks that have proven themselves over time via a steadily increasing dividend is a good first step.

If those companies also happen to be industry leaders, all the better. Here are three such companies that, when they go on sale, you should probably consider adding to your portfolio.

Procter & Gamble (NYSE: PG) has a market cap of over $340 billion, making it one of the largest consumer staples companies on the planet. It has the scale to invest heavily in advertising, distribution, and -- perhaps most important -- research and development.

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Source Fool.com