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Great-Grandpa’s Big Invention
My great-grandfather, Clarkson Valentine Hendrickson Jr. (1890–1964) was a mechanical engineer or draftsman as I remember my father describing his occupation. But I never had…
My great-grandfather, Clarkson Valentine Hendrickson Jr. (1890–1964) was a mechanical engineer or draftsman as I remember my father describing his occupation. But I never had…