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The Pencil Hardness Test
瀏覽：332
日期：2025-06-21
The Pencil Hardness Test By Mac Simmons This article appeared in Woodwork, April 2000, p76. and is used here by permission. A set of graded pencils After doing some testing on various coatings for their 'pencil hardness', I was surprised at the results I...看更多
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