Henry Ernest Dudeney/Puzzles and Curious Problems/350 - The Keys and Ring

by : $350$

 * The Keys and Ring
 * Colonel Crackham the other day produced a ring and two keys, as here shown,
 * ''cut out of a solid piece of cardboard, without a break or join anywhere.


 * Dudeney-Puzzles-and-Curious-Problems-350.png