Question 1

When was Johan Fredrik Theodoor van Valkenburg born?

Accepted Answer

Johan Fredrik Theodoor van Valkenburg was born on 1877-03-31.

Question 2

When did Johan Fredrik Theodoor van Valkenburg die?

Accepted Answer

Johan Fredrik Theodoor van Valkenburg died on 1975-06-03.

Johan Fredrik Theodoor van Valkenburg

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