# Relationship history for MSHA mine 1512911

Current hierarchy: **Mullins Elzy → Evon Coal Company Inc → Evon No 1 Surface 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:** Evon Mining Company Inc → Evon No 1 Surface Mine; 1981-05-01 to 1981-11-09; source msha-controller-operator-history
- **controller_controls_mine:** Sanders Ronald → Evon No 1 Surface Mine; 1981-05-01 to 1981-11-09; source msha-controller-operator-history
- **controller_controls_operator:** Sanders Ronald → Evon Mining Company Inc; 1981-05-01 to 1981-11-09; source msha-controller-operator-history
- **operator_operates_mine:** Evon Coal Company Inc → Evon No 1 Surface Mine; 1981-11-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mullins Elzy → Evon No 1 Surface Mine; 1981-11-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mullins Elzy → Evon Coal Company Inc; 1981-11-10 to current/open; source msha-controller-operator-history