# Relationship history for MSHA mine 0201236

Current hierarchy: **Orban William S → Orban Excavating Inc → Orban 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

- **operator_operates_mine:** Construction Fill Materials → Orban Pit; 1950-01-01 to 1981-03-10; source msha-controller-operator-history
- **controller_controls_mine:** Hurt Bill → Orban Pit; 1950-01-01 to 1981-03-10; source msha-controller-operator-history
- **controller_controls_operator:** Hurt Bill → Construction Fill Materials; 1950-01-01 to 1981-03-10; source msha-controller-operator-history
- **operator_operates_mine:** Orban Excavating Inc → Orban Pit; 1981-03-11 to 1985-05-15; source msha-controller-operator-history
- **controller_controls_mine:** Orban Barbara → Orban Pit; 1981-03-11 to 1985-05-15; source msha-controller-operator-history
- **controller_controls_operator:** Orban Barbara → Orban Excavating Inc; 1981-03-11 to 1985-05-15; source msha-controller-operator-history
- **operator_operates_mine:** Orban Excavating Inc → Orban Pit; 1985-05-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Orban William S → Orban Pit; 1985-05-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Orban William S → Orban Excavating Inc; 1985-05-16 to current/open; source msha-controller-operator-history