# Relationship history for MSHA mine 1507980

Current hierarchy: **Meade G W → Meade & Couch Coal Company Inc → No 1 Mine**

- 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:** Cornett & Lewis Coal Company → No 1 Mine; 1975-01-01 to 1983-06-21; source msha-controller-operator-history
- **controller_controls_mine:** Cornett Donald → No 1 Mine; 1975-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cornett Donald → Cornett & Lewis Coal Company; 1975-01-01 to 1983-06-21; source msha-controller-operator-history
- **operator_operates_mine:** Meade & Couch Coal Company Inc → No 1 Mine; 1983-06-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Meade G W → No 1 Mine; 1983-06-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Meade G W → Meade & Couch Coal Company Inc; 1983-06-22 to current/open; source msha-controller-operator-history