Casio
Japanese electronics company
Could Casio's first invention be worn around the ankle?
Casio's first invention was the yubiwa pipe. The yubiwa pipe was a ring worn that held a cigarette in place worn on the finger. Ankles are several inches thicker than fingers.
What was Casio's first invention? Where was #1 worn? What is the largest diameter of #2? What is the smallest diameter of ankle? Is #4 less than or equal to #3?