Composition on pencil for 6th
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In a composition for the manufacturer of fired pencil lead which contains graphite powder , clay , water and optionally carbon black , where in at least the clay is digested with the water and the composition is pressed , dried and fired ,the improvement comprising the composition which contains a digestion agent selected ....
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In a composition for the manufacturer of fired pencil lead which contains graphite powder , clay , water and optionally carbon black , where in at least the clay is digested with the water and the composition is pressed , dried and fired ,the improvement comprising the composition which contains a digestion agent selected ....
hope it helps you
THANK YOU
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