Jelle. "JELLE'S PASSION" Archived 23 April 2019 at the Wayback Machine, Knikkerbaan.nl, Netherlands. Retrieved on 27 March 2019. Capelle, Romain. "The balls...
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knikkerbanen archief – Jelle's Knikkerbanen". Jelle's Marble Runs. Jelle's Knikkerbaan. Retrieved 29 August 2019. Wikimedia Commons has media related to Wervershoof...
6 KB (441 words) - 05:10, 1 September 2024
Spacewarp project with special effects and homemade parts)". Jelle's Knikkerbaan (in Dutch). Archived from the original on November 15, 2014. "Marble...
16 KB (941 words) - 14:48, 20 August 2024