Gears of Rockwell Hardness - September/October 2002
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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