https://www.cnbc.com/2018/05/02/nikola-motor-sues-tesla-alleging-design-patent-violation.html

Nikola Motor Co, which makes hydrogen-powered semi trucks, filed a lawsuit on Tuesday against electric automaker Tesla Inc alleging design patent infringements.

Tesla's Semi, its first electric heavy duty truck, is "substantially" similar to Nikola's design, Nikola Motor said in a court filing.