The Encyclopedia Frobizzica
Technology Museum
From Zork III (In-Game Description):
A plaque is mounted near the door. The grey machine, it turns out, is a Frobozz Magic Pressurizer, used in the coal mines of the Empire. The black machine is a Frobozz Magic Room Spinner. The golden machine is referred to as a Temporizer. All are non-working models donated by Frobozzco president John D. Flathead.