The Hippo Water Roller seems to be as simple as it is ingenious. How and why did the inventors Pettie Petzer and Johan Jonker come up with this solution?
https://blog.empowering-people-network.siemens-stiftung.org/wp-content/uploads/2014/08/csm_49_Hippo_water_Roller_01_faca57b1cc.jpg234614Sabine Baumeister//blog.empowering-people-network.siemens-stiftung.org/wp-content/uploads/2016/02/siemens_logo_white.pngSabine Baumeister2014-08-04 14:20:572016-08-04 13:17:10Interview with Grant Gibbs, founder of the Hippo Water Roller Project
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