The question Falcon 9 2nd stage pusher; how far does it continue to extend as it accelerates separation? includes (and further explains) the GIF below.

Question: What was the first use of a "2nd stage pusher", a rod that extends from one stage and pushes against the other in order to add a small relative separation velocity between the two before the upper stage starts its engine?

Falcon 9 2nd stage separation pusher



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