platoon system
... that the first recorded use of the platoon system in baseball dates back to 1887?
... that the first recorded use of the <b id="mwB2U"><a href="./Platoon_system" id="mwB2Y" rel="mw:WikiLink" title="Platoon system">platoon system</a></b> in <a href="./Baseball" id="mwB2c" rel="mw:WikiLink" title="Baseball">baseball</a> dates back to 1887?