# Relationship history for MSHA mine 1102827

Current hierarchy: **Florence L  Propheter → Tri-County Quarries Inc → Voss Quarry**

- 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:** Tri-County Quarries Inc → Voss Quarry; 1985-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Florence L  Propheter → Voss Quarry; 1985-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Florence L  Propheter → Tri-County Quarries Inc; 1985-05-01 to current/open; source msha-controller-operator-history