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Om de ouderdom te bepalen zijn vier monsters aangeleverd voor dendrochronologisch onderzoek. Voor de sluis ging het om drie vuren (Picea abies Karst.) monsters, waarvan er één voldoende jaarringen voor onderzoek had, maar niet gedateerd kon worden. Voor de brug is een dwarsdoorsnede van een zware eiken (Quercus sp.) paal aangeleverd. Hiervan kan de laatste jaarring in 1808 gedateerd worden. 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