- Ace Carbon Brush Co
- ACI Standard
- Burk's Painting
- Burk's Refrigeration
- Burk's Towing & Recovery
- Burkshire Financial Group
- Danmar Industries Inc
- Energy Conversion Systems
- Helwig Carbon Products Inc
- National Electric Carbon
- National Electrical Carbon
- Ohio Power Tool Brush Co
- South Land Carbon Products Inc
- Standard Carbon-Ohio Inc
- Tran Supply Inc