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Persons / Toll, F. engineer
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Gerhard, Ivan Kondratyevich ( Johann - Konrad) (1720–1808), an engineer, privy councillor.

Gerhard, Ivan Kondratyevich ( Johann - Konrad) (1720–1808), an engineer, privy councillor. He was born in Germany (Schwabia) and he got the elementary education there after that he learned at the Academy of Sciences in St Petersburg

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