| Business | Phone |
| Wylie Precision Grinding Inc 4450 Emerald Ave, Cincinnati 45242 | (513) 984-2783 |
| Midwest Centerless Grinding 1115 Straight St, Cincinnati 45214 | (513) 541-8076 |
| Mills Grinding & Machine Co 1000 Devils Backbone Rd, Cincinnati 45233 | (513) 451-1326 |
| Northside Grinding Co 1517 Knowlton St, Cincinnati 45223 | (513) 681-3550 |
| Owens Precision Grinding 8383 Blue Ash Rd, Cincinnati 45236 | (513) 745-9335 |
| R A Heller Co 10530 Chester Rd, Cincinnati 45215 | (513) 771-6100 |