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|Number of cells||23|
|Year of discovery||1971|
Light bulb is a period 2 oscillator that was found in 1971. Its rotor is the only known 3-cell period 2 rotor, and it can be embedded in a slightly smaller stator, giving the 21-cell variant shown below. Two other variants of this oscillator are also known.
- "Period 2 Oscillator Rotors". Retrieved on March 16, 2009.