Newbie Question: System Facilities Cumulative?

[Chronon]

Are the bonuses for System Robotoid Factory and System Radioactives Collider cumulative? In other words, do I get a 60% system-wide bonus on radioactives production with these two facilities(30% from each one)? Does the same hold true for the other resource specific system facilities (I forget what they're called, the ones for organics and minerals)?

Thanks for your help!