They have been digging these cylinders up in North America, since the late 19th century. How they were used has been a longstanding mystery. I believe Don Crabtree worked with them for about 45 minutes, and said that they were of "limited value". Yet, all the records point to an intense record of use going back to the advent of the archaic era, in many places. So, if anyone can figure it out, it will resolve a very longstanding mystery that has endured for a century.
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