@KleinerWuuki @sarahbecan I *think* (but don’t know) that the historical background for the German saying is this:
General technical norms (eg. which way to thread a screw) only really began to be established when the German states were unified into the Reich in 1871.
Before that, most states would have had their own norms, or none at all.
@slothrop @sarahbecan That certainly sounds plausible. But whether it is exactly like that, I unfortunately don't know either.