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American Standard Test Sieve Series ASTM, International & British Standard Test Sieve Series ISO:3310 / BS:410
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Gilson 8-Inch (203mm) ASTM E11 Test Sieve, All Stainless Steel, No. 20 (850µm) Opening Size, Full Height (V8SF #20): Science Lab Sieves: Amazon.com: Industrial & Scientific
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