Japan
Olympus
Olympus sold its camera business to OM Digital Solutions in 2021. The OM film mount ended with film, so OM lenses need an adapter on anything digital. Film bodies are serviced independently.
The OM system was built around small size, and its lenses are still among the most compact full-frame manual primes around, which is why they get adapted to mirrorless bodies. The camera business now belongs to OM Digital Solutions, which does not service the film bodies.