Looks like the town is a center for control valve manufacturing - Wittler, ARI, and Parker Hannefin.
No Johnson Controls?
“Police have arrested a 56-year-old man on suspicion of trying to kill his colleague at ARI Armaturen, which makes industrial components such as valves, in the town of Schloss Holte-Stukenbrock.”
From the link in #13.
JCI and Honeywell are all over Chicagoland, not far from me!
It’s the proportional control valves and that hysteresis thing!
Pushes them right over the edge.
When noticed they are laterally transferred to some ancient line of pneumatics.
Testing the diaphragm response on a circular stream of valves. And they never seem to notice.