# Relationship history for MSHA mine 4603303

Current hierarchy: **Edward A  Asbury → Superior Processing, Inc. → Superior Cleaning Plant**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Cannelton Industries Inc → Superior Cleaning Plant; 1950-01-01 to 1998-06-28; source msha-controller-operator-history
- **controller_controls_mine:** Cyprus Amax Minerals Company → Superior Cleaning Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cyprus Amax Minerals Company → Cannelton Industries Inc; 1950-01-01 to 1998-06-28; source msha-controller-operator-history
- **operator_operates_mine:** Cannelton Industries Inc → Superior Cleaning Plant; 1998-06-29 to 2004-10-17; source msha-controller-operator-history
- **controller_controls_mine:** Horizon Natural Resources Incorporated → Superior Cleaning Plant; 1998-06-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Horizon Natural Resources Incorporated → Cannelton Industries Inc; 1998-06-29 to 2004-10-17; source msha-controller-operator-history
- **operator_operates_mine:** Superior Processing, Inc. → Superior Cleaning Plant; 2004-10-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** D L (Jack)  Bowling → Superior Cleaning Plant; 2004-10-18 to 2008-03-31; source msha-controller-operator-history
- **controller_controls_operator:** D L (Jack)  Bowling → Superior Processing, Inc.; 2004-10-18 to 2008-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Edward A  Asbury → Superior Cleaning Plant; 2008-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Edward A  Asbury → Superior Processing, Inc.; 2008-04-01 to current/open; source msha-controller-operator-history