# Relationship history for MSHA mine 4605171

Current hierarchy: **John C  Geupel → Logan County Airport Contractors → Logan Surface Mine No 978**

- 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:** Concord Coal Corp → Logan Surface Mine No 978; 1976-01-01 to 1981-10-15; source msha-controller-operator-history
- **controller_controls_mine:** Walsh David E → Logan Surface Mine No 978; 1976-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Walsh David E → Concord Coal Corp; 1976-01-01 to 1981-10-15; source msha-controller-operator-history
- **operator_operates_mine:** Logan County Airport Contractors → Logan Surface Mine No 978; 1981-10-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John C  Geupel → Logan Surface Mine No 978; 1981-10-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John C  Geupel → Logan County Airport Contractors; 1981-10-16 to current/open; source msha-controller-operator-history