# Relationship history for MSHA mine 4406784

Current hierarchy: **Jason  Elkins → Jeco Inc → Quality Coal Sales**

- 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:** W D Coals Inc → Quality Coal Sales; 1994-11-01 to 1999-10-03; source msha-controller-operator-history
- **controller_controls_mine:** David  Grigsby → Quality Coal Sales; 1994-11-01 to 1999-10-03; source msha-controller-operator-history
- **controller_controls_operator:** David  Grigsby → W D Coals Inc; 1994-11-01 to 1999-10-03; source msha-controller-operator-history
- **operator_operates_mine:** Jeco Inc → Quality Coal Sales; 1999-10-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jason  Elkins → Quality Coal Sales; 1999-10-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jason  Elkins → Jeco Inc; 1999-10-04 to current/open; source msha-controller-operator-history