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Gears of Rockwell Hardness - September/October 2002

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Archive > 2002 > September/October 2002 > Gears of Rockwell Hardness

The article "Gears of Rockwell Hardness" appeared in the September/October 2002 issue of Gear Technology.

Summary
Nobody's sure what went on in Bolsa Chica, CA, when gear-shaped stones were used there 8,700 years ago, but a popular belief is that at least some activity revolved around manufacturing.

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