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The robot can also autonomously alternate between a rolling or self-propulsion mode depending on what’s best for navigating a particular environment.—Mack Degeurin, Popular Science, 9 Oct. 2024 An electric starter and self-propulsion make this Toro snow blower easy to use.—Ben Romans, Field & Stream, 4 Jan. 2024 The objects were unmanned, appeared to be moving by prevailing winds, not self-propulsion, and had no communications signals, according to national security officials.—Joey Garrison, USA TODAY, 16 Feb. 2023
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