# Relationship history for MSHA mine 4103171

Current hierarchy: **Dement Ivan → Ivan Dement Inc → Gurley 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Dement Ivan → Gurley Pit; 1978-03-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** De Pauw Wilbur → Gurley Pit; 1979-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** De Pauw Construction Inc → Gurley Pit; 1983-05-01 to 1984-12-16; source msha-controller-operator-history
- **controller_controls_operator:** De Pauw Wilbur → De Pauw Construction Inc; 1983-05-01 to 1984-12-16; source msha-controller-operator-history
- **operator_operates_mine:** Ivan Dement Inc → Gurley Pit; 1984-12-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dement Ivan → Ivan Dement Inc; 1984-12-17 to current/open; source msha-controller-operator-history