0001019687-07-000314 SC 13G/A 1 20070207 20070207 AMISTAR CORP 0000741559 3559 952747332 CA 1231 SC 13G/A 34 005-36907 07586718 237 VIA VERA CRUZ SAN MARCOS CA 92069 6194713967 237 VIA VERA CRUZ SAN MARCOS CA 92069 BAKER STUART 0000903680 SC 13G/A 7604713959 C/O AMISTAR CORP 237 VIAVERA CRUZ SAN MARCOS CA 92069-2698 SC 13G/A 1 baker_13ga4-amistar.txt AMENDMENT NO. 4