# Relationship history for MSHA mine 1302319

Current hierarchy: **John J  Healey → Healy Excavating → Plant #1**

- 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:** Tiefenthaler Dean → Plant #1; 1984-12-01 to 2006-02-12; source msha-controller-operator-history
- **operator_operates_mine:** Healy Excavating → Plant #1; 2006-02-13 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John J  Healey → Plant #1; 2006-02-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John J  Healey → Healy Excavating; 2006-02-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tiefenthaler Dean → Healy Excavating; 2006-02-13 to 2006-02-12; source msha-controller-operator-history