Jan Hendrik Koopman
(I25878)
Birth 18 August 1905 -- Groningen, Groningen, Groningen, Netherlands
Death 17 August 1959 (Age 53) -- Groningen, Groningen, Groningen, Netherlands
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Sikko Koopman
(I25873)
Birth 3 December 1868 -- Groningen, Groningen, Groningen, Netherlands
Death 29 January 1938 (Age 69) -- Groningen, Groningen, Groningen, Netherlands
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