# Relationship history for MSHA mine 5001783

Current hierarchy: **Oscar F.  Chavez → Heritage Rock & Services → HRS Delta 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:** Mc Collum Douglas → HRS Delta Pit; 1980-02-01 to 2003-09-09; source msha-controller-operator-history
- **operator_operates_mine:** Delta Concrete Products → HRS Delta Pit; 2003-09-10 to 2023-06-23; source msha-controller-operator-history
- **controller_controls_mine:** Matthew J  Walker → HRS Delta Pit; 2003-09-10 to 2022-06-23; source msha-controller-operator-history
- **controller_controls_operator:** Matthew J  Walker → Delta Concrete Products; 2003-09-10 to 2022-06-23; source msha-controller-operator-history
- **controller_controls_operator:** Mc Collum Douglas → Delta Concrete Products; 2003-09-10 to 2003-09-09; source msha-controller-operator-history
- **controller_controls_mine:** Oscar F.  Chavez → HRS Delta Pit; 2022-06-24 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Heritage Rock & Services → HRS Delta Pit; 2023-06-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Oscar F.  Chavez → Heritage Rock & Services; 2023-06-24 to current/open; source msha-controller-operator-history