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In July 2020, I found a Canadian M.F. Christensen Patent in Belpre, Ohio. Upon further speaking with the antique dealer, the patent came from an estate sale in Bridgeport, West Virginia, to him. I contacted Michael Cohill (M.F. Christensen Expert), Michael Johnson (Co-Author of “American Machine-Made Marbles”, and Roger Hardy (Owner of the worlds largest Akro Agate collection and author of “The Complete Line of Akro Agate”) and I combed through the records that they sent me. I interviewed them while going through the entire records with them and received their approval when the report was finished and sent to them for verification. The link below is my full report for free, on academia.edu. - Benjammin Sampson https://www.academia.edu/44281826/The_Hidden_History_of_the_Marble_Industry