Family trees
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| Notice 1: | It is the invention of the thermal engine which causes the true simultaneous inceptions of the car and the motor bike. |
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| Notice 2: | The car and the motor bike have only the wheel and the internal combustion engine jointly. |
| Notice 3: | The car gets out of the horse-drawn carriage. The motor bike is the heiress of a ludic machine: the draisienne. |
| Conclusion: | The motor bike has its own line. It is not and will be never a car with two wheels. |
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