What year did slingshots become automatic?

I'm curious to know, what specific year marked the transition from traditional slingshots to automatic slingshots? I understand that technological advancements have significantly impacted various weapons and tools throughout history, and I'm fascinated by how these changes occurred in the realm of slingshots. Was there a particular innovation or breakthrough that led to the automation of slingshots, and if so, can you elaborate on the year and the significance of this development?