# Relationship history for MSHA mine 0102287

Current hierarchy: **Trimble Riley O → Trimble Contracting Company → Franklin 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:** Trimble Riley O → Franklin Pit; 1979-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Trimble Contracting Company → Franklin Pit; 1981-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Trimble Riley O → Trimble Contracting Company; 1981-01-01 to current/open; source msha-controller-operator-history