Geir S. Ulvik

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Geir S. Ulvik
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The Wave Pump - This is a wave-driven drainage pump with no moving parts. It can cheaply be made of concrete and may be useful where the sea level is rising.

The Wave Pump - This is a wave-driven drainage pump with no moving parts. It can cheaply be made of concrete and may be useful where the sea level is rising.

Bau von Leimknechten / Leimzwingen Bauanleitung zum selber bauen

Bau von Leimknechten / Leimzwingen Bauanleitung zum selber bauen