# Relationship history for MSHA mine 4606259

Current hierarchy: **Campbell Resources Inc → Coal Corp Of America Inc → Excelsior Ridge Surface**

- 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

- **controller_controls_mine:** Beasley Industries Inc → Excelsior Ridge Surface; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Peaker Run Coal Company Inc → Excelsior Ridge Surface; 1980-12-01 to 1983-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Beasley Industries Inc → Peaker Run Coal Company Inc; 1980-12-01 to 1983-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Campbell Resources Inc → Excelsior Ridge Surface; 1981-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Coal Corp Of America Inc → Excelsior Ridge Surface; 1983-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Campbell Resources Inc → Coal Corp Of America Inc; 1983-10-01 to current/open; source msha-controller-operator-history