How many concrete mixers are there in the U.S.?

I am really concerned about the market for the blades and paddles that wear down periodically. I need to know either how many mixers are sold, how often a blade needs replaced, or how many blades are sold annually.

Answer:
It is probably in the millions of blades sold. Here are the websites of people in that business and most hold patents for their blades. Product liability would be a factor as well.
Why? Seriously?

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