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Flyrod,
Atlas also listed SAE 10 in all of their publications prior to 1947. Their first Atlas QCGB Operator's Manual published in 1947 says SAE 20 and the first Craftsman one printed in 1950 says SAE 20. Tthe MOLO, as far as I can tell (prior to 1954 they are hard to date) continued to say SAE 10 until 1954 when it changed to SAE 20. No reason is given for the change.
Atlas also listed SAE 10 in all of their publications prior to 1947. Their first Atlas QCGB Operator's Manual published in 1947 says SAE 20 and the first Craftsman one printed in 1950 says SAE 20. Tthe MOLO, as far as I can tell (prior to 1954 they are hard to date) continued to say SAE 10 until 1954 when it changed to SAE 20. No reason is given for the change.