Although I have zero data to back up my hypothesis, here's my take on the introduction of NSI to Niterra (I could be wrong). NSI needed ammonia sensors, Niterra makes them, NSI purchases them from Niterra, NSI has problems installing/calibrating them and asks for a tech team to visit, Niterra visits and likes NSI's tech (GE does a sales job on them), and "voila" a relationship is born.