I write on Fri, 15 Jul 1994 11:11:57 GMT (Subject: automatic mixture rebreathers: price & flexibility):- .... * a ppO2 (or 2 or 3) and some simple electronics and valves to keep the ppO2 in the set range; .... Those 2 lines should read:- .... * a ppO2 sensor (or 2 or 3) and some simple electronics and valves to keep the ppO2 in the set range;
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