He is credited with inventing the slab as we know it and the 10 point grading system. He had a patent or patents, although I don't recall the details or whether they were ever challenged. ASA (Accugrade) did not in any event enjoy a good reputation.
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Net 54-- the discussion board where people resent discussions. 
My avatar is a sketch by my son who is an art school graduate. Some of his sketches and paintings are at
https://www.jamesspaethartwork.com/
Last edited by Peter_Spaeth; 01-19-2025 at 06:29 PM.
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