# Relationship history for MSHA mine 1800589

Current hierarchy: **Pierce  Flanigan → Stancills Inc → Joppa Plant**

- 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

- **operator_operates_mine:** Stancills Inc → Joppa Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Terry D  Stancill et al → Joppa Plant; 1950-01-01 to 2017-11-02; source msha-controller-operator-history
- **controller_controls_operator:** Terry D  Stancill et al → Stancills Inc; 1950-01-01 to 2017-11-02; source msha-controller-operator-history
- **controller_controls_mine:** Pierce  Flanigan → Joppa Plant; 2017-11-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Pierce  Flanigan → Stancills Inc; 2017-11-03 to current/open; source msha-controller-operator-history