Re: Flat Black
How about?
"Eichberger managed to keep the technical details of his invention a secret for nearly thirty years, during which time he extracted colossal profits from the monopoly on interstellar trade, and reinvested them all in expanding his fleet."
OR
"Eichberger managed to keep his invention a trade secret for nearly thirty years, during which time he extracted colossal profits from the monopoly on interstellar trade, and reinvested them all in expanding his fleet."
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