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<br /> <br />HUMIDITY CELL TESTS <br />pH of sanpl• Lachal~s <br /> 9.00 <br /> 7.00 <br /> 6.00 <br /> 5.00 <br />N <br />V <br />C <br /> <br />2 4.00 <br />a <br />x <br />a <br /> 3.BB <br /> 2.00 <br /> 1.90 <br /> 0.00 <br />20 22 24 26 28 30 <br />^ M7 B-9fUR) <br />M7 43-63<UR1 <br />`~' MB 132-143<UR) <br />TIME <uecks) <br />