# Relationship history for MSHA mine 1100193

Current hierarchy: **Dillon Patrick L → P L Dillon Limestone Inc → Belk 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:** Robert R  Mathias → Belk Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Dillon Patrick L → Belk Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Rees Construction Company Inc → Belk Pit; 1980-07-01 to 1980-09-01; source msha-controller-operator-history
- **controller_controls_operator:** Robert R  Mathias → Rees Construction Company Inc; 1980-07-01 to 1980-09-01; source msha-controller-operator-history
- **operator_operates_mine:** P L Dillon Limestone Inc → Belk Pit; 1980-09-02 to 1981-02-14; source msha-controller-operator-history
- **controller_controls_operator:** Dillon Patrick L → P L Dillon Limestone Inc; 1980-09-02 to 1981-02-14; source msha-controller-operator-history
- **operator_operates_mine:** Rees Construction Company Inc → Belk Pit; 1981-02-15 to 1981-06-25; source msha-controller-operator-history
- **controller_controls_operator:** Robert R  Mathias → Rees Construction Company Inc; 1981-02-15 to 1981-06-25; source msha-controller-operator-history
- **operator_operates_mine:** P L Dillon Limestone Inc → Belk Pit; 1981-06-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dillon Patrick L → P L Dillon Limestone Inc; 1981-06-26 to current/open; source msha-controller-operator-history