Super Durable Keyboards?

Pappy VanSlashdot asks: "Slashdot readers have had some great recommendations for durable mice, even industrial strenght mice. How about keyboards? I need to put about a dozen PCs on a factory floor where the main problem will be sand and other dust. I don't think run of the mill keyboards would last very long. I'm well within the budget for this project (thanks to using a lot of free software) so I can spend just about anything to get something that works."