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Posted By: bruce moreland

Thanks for the nice comments about my article.

When Dr. Koos was selling either the PRO Jackson or the Mantle, at one point he switched tack and announced that PRO was fine, and defied anyone to show differently.

I thought that was a very interesting challenge, and that's one reason I did this.

If someone tries to say that since grading is necessarily subjective, that all grading companies are the same, please feel free to send them the URL to my article.

bruce