# Relationship history for MSHA mine 1511370

Current hierarchy: **Geary Donald C → Geary Brothers Coal Company → Geary Brothers Mine No 2**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Geary Donald C → Geary Brothers Mine No 2; 1977-09-06 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Geary Brothers Coal Company → Geary Brothers Mine No 2; 1978-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Geary Donald C → Geary Brothers Coal Company; 1978-05-01 to current/open; source msha-controller-operator-history