# Relationship history for MSHA mine 4605375

Current hierarchy: **Edward A  Asbury → Banna Run Coal Company Inc → #21**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Ridgeland Company Inc → #21; 1976-12-01 to 1983-08-04; source msha-controller-operator-history
- **controller_controls_mine:** Monahan William Robert Et Al → #21; 1976-12-01 to 1983-08-04; source msha-controller-operator-history
- **controller_controls_operator:** Monahan William Robert Et Al → Ridgeland Company Inc; 1976-12-01 to 1983-08-04; source msha-controller-operator-history
- **operator_operates_mine:** Banna Run Coal Company Inc → #21; 1983-08-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Edward A  Asbury → #21; 1983-08-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Edward A  Asbury → Banna Run Coal Company Inc; 1983-08-05 to current/open; source msha-controller-operator-history