Rav Yitzchak Schmelkes of Lemberg.
Rav Moshe paskened it prohibited to put an air conditioner on a timer for Shabbos. Do you follow that? Rav Moshe also writes in the Igros other poskim may disagree with him (speaking generally). Can no one follow other poskim when Rav Moshe disagrees? The issue of copying doesn’t have a strong consensus among all the gedolei poskim.