Abstract Study on the performance of the eraser, using the type of timber and the substance, timber is an invention of the eraser. Study on variables such as the type of chemical species of the type of timber, timber, water, water, water, water, timber, timber species and Thai varieties India. Kinds of chemicals, including sulfuric and acetic acid Results from the survey showed that currently, the Eraser is very expensive. The performance of the eraser, Eraser invention bad enough itself to save the expense required for stationery and from this cause Group. a comparative study of the type of timber that affect performance in the cleaning of the eraser. I found that when both types of erasers to compare performance. Using a 5 cm long tick 2B on A4 paper, the criteria used to measure the color of the gradient, Eraser, rubber water from scratch, rather than powerful Thai India. Through a comparative study of level .... what kind of water mixed with chemicals, timber. The test criteria will apply as well as gradient color bar value. I found that the eraser with a mixture of sulfur, there will be a performance better than the eraser with acetic acid as the ingredients to. ... Level.
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