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EMC 5/16 3F SE 1-3/8FL UNC 3INOAL 5/16SH 3INOAL SER 273 SQUARE END SOLID CARBIDE HIGH PERFORMANCE ALUMINUM CUTTER ENDMILL CC RHS/RHC 42DEG HELIX UNCOATED LONG LENGTH ROUGHER / FINISHER NO-FLAT AL|Monster Tool Company||
www.westtool.com
These guys supposedly have a location in Portland. This particular endmill should be very close to what you were using (with perhaps a tighter helix angle).
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