Hennink Puzzle - Who invented this puzzle originally?

Print it yourself at https://oskarvandeventer.nl/Print-It-.... Buy at https://i.materialise.com/en/shop/ite... or at https://www.shapeways.com/product/KTU...    Hennink Puzzle is a remake of a puzzle that I found in Japan. The object is to remove the key from the box. The puzzle was made for a local installation company as 3D-printed premium gift. The key is used to vent air from a central-heating system. I am still looking for the name of the original designer, as well as the name of the original puzzle. Can you help me here?

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