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Pretty to look at but not too useful. They forgot one of the fundimental rules of scientific testing..... Unchanging variables. Did he fill the tank up to the same pressure after every regulator? As the 4500psi or whatever pressure drops in the tank it is going to cause a longer recharge rate. Less pressure from the tank means less push and slower airflow. I certainly appreciate the effort though, I just wish I could believe the results.
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By the time a man realizes that maybe his father was right, he usually has a son who thinks he's wrong.
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