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Ball (bearing): Revision history


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  • curprev 04:4304:43, 19 December 2022 Greg L talk contribs 11,966 bytes −856 “Seismic use” deleted. The San Francisco airport’s seismic isolators don’t contain bearing balls. They are “friction pendulum seismic isolation bearings” (concave vs. convex surfaces) made by Earthquake Protection Systems, Richmond, California undo

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