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cal 11 and other microrotor questions....

the post about values on the carrera cal 11, got me thinking. how long was the cal 11 produced before being replaced by the cal 12? i've read/heard the cal 11 had problems, what exactly were these problems that forced the switch to the cal 12? as far as the other microrotor autos what was the reason(s) behind the eventual replacing of the cal 12, and of course the eventual discontinuation of the microrotor from production? thanks in advance!


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