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Alright darn it, I know Nakamura worked at the Bureau of Commercial Fisheries Biological Laboratory in Osaka. I know he wrote papers on captive sea water systems. I know he wrote papers on sea water well systems for the Dept of the Interior in Honolulu.
He developed the systems for holding and maintaining tuna in totally closed systems and went into great detail on settling sand filters - we call them deep sand beds.
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