# Relationship history for MSHA mine 1512038

Current hierarchy: **Hamblin Tyce → White Winter Coals Inc → David**

- 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

- **controller_controls_mine:** Shattuck Tom N → David; 1978-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** White Winter Coals Inc → David; 1979-09-01 to 1980-07-29; source msha-controller-operator-history
- **controller_controls_operator:** Shattuck Tom N → White Winter Coals Inc; 1979-09-01 to 1980-07-29; source msha-controller-operator-history
- **operator_operates_mine:** White Winter Coals Inc → David; 1980-07-30 to 1980-09-10; source msha-controller-operator-history
- **controller_controls_mine:** Ellison Roy → David; 1980-07-30 to 1980-09-10; source msha-controller-operator-history
- **controller_controls_operator:** Ellison Roy → White Winter Coals Inc; 1980-07-30 to 1980-09-10; source msha-controller-operator-history
- **operator_operates_mine:** White Winter Coals Inc → David; 1980-09-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hamblin Tyce → David; 1980-09-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hamblin Tyce → White Winter Coals Inc; 1980-09-11 to current/open; source msha-controller-operator-history