[Copied to the Flute Forum. - Mod]
Reading up on the history of natural horns some included holes at certain points to bring the pitch in tune. For awhile it seems keyed Bugles were a thing.
https://en.m.wikipedia.org/wiki/Keyed_bugle
On the other hand, reed instruments also seem to be primarily keyed with the rare outliers so I guess brass instraments are the outliers?