LJ was quick to point that out in the second paragraph of his original post.

Did the Bee-Space exist before 1850 ? Well, actually no. But that's not to say that the bees hadn't been creating such a spacing between their combs for several million years before then, it's just that the Bee-Space per se didn't exist until someone observed, measured and thus defined it.
Of course it existed, but Langstroth is credited for recognizing its importance and defining it. Prior to that, the term did not exist, even though the space always has.