File:Prins Bernhard zich in het Psychotechnisch Laboratorium van den P.T.T.-dienst, 1937.jpg
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![File:Prins Bernhard zich in het Psychotechnisch Laboratorium van den P.T.T.-dienst, 1937.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/4/4f/Prins_Bernhard_zich_in_het_Psychotechnisch_Laboratorium_van_den_P.T.T.-dienst%2C_1937.jpg/442px-Prins_Bernhard_zich_in_het_Psychotechnisch_Laboratorium_van_den_P.T.T.-dienst%2C_1937.jpg?20240411095448)
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