Sieve, 500 Microns, for Manufacture of Solid Rocket Fuel
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Cylindrical, brass colored
Manufacturer's label: U.S.A. Standard Testing Sieve - A.S.T.M. - E-1 1 - No. 35 - Opening Micrometers 500 - Tyler equivalent of 35 mesh - Opening 32 Microns; Opening 0.197 in.