N-P Grinding Inc Map phone 3700 E 10 Mile Rd Warren, Michigan 48091 Precision Cutter Grinding Co Map phone 25245 Mound Rd Warren, Michigan 48091 Precision Sharpeners Map phone 11123 E 9 Mile Rd Warren, Michigan 48089 Rite-Way Cutter Sharpening Co., Inc. Map phone 3517 E 8 Mile Rd Warren, Michigan 48091