0001019687-07-000315 SC 13G/A 1 20070207 20070207 AMISTAR CORP 0000741559 3559 952747332 CA 1231 SC 13G/A 34 005-36907 07586729 237 VIA VERA CRUZ SAN MARCOS CA 92069 6194713967 237 VIA VERA CRUZ SAN MARCOS CA 92069 MARSHALL GORDON S 0000940190 SC 13G/A 237 VIA VERA CRUZ SAN MARCOS CA 92069 SC 13G/A 1 marshall_13ga4-amistar.txt AMENDMENT NO. 4