# Relationship history for MSHA mine 1100672

Current hierarchy: **Dillon Patrick L → P L Dillon Limestone Inc → Dixon Pit**

- 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:** Dillon Patrick L → Dixon Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** P L Dillon Limestone Inc → Dixon Pit; 1981-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dillon Patrick L → P L Dillon Limestone Inc; 1981-05-01 to current/open; source msha-controller-operator-history