Charles II or Charles John Amadeus (Carlo Giovanni Amedeo in Italian) b.1489-d.1496, was the Duke of Savoy from 1490 to 1496 but his mother Blanche of Montferrato[?] was the actual ruler as a regent.
... axis of the gyroscope in the Dynabee is fixed to the spinning mass and it rests in a little groove inside the wrist exerciser device, which almost completely covers ...