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The M 5 is the conversion of the 109 into the era of plastic. The technique was identical at the beginning, some time later, a venturi-flap was added. The next invention was a optimination for cold conditions. The inner parts were now made of delrin to prevent getting ice on the parts and the reg was renamed M 5 Polar. At the same time, the adjustment knob was enlarged to be more handier.
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