# Relationship history for MSHA mine 3600818

Current hierarchy: **Jamison Philip R → Leechburg Mining Company → Foster No 65**

- 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

- **operator_operates_mine:** Leechburg Mining Company → Foster No 65; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jamison Philip R → Foster No 65; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jamison Philip R → Leechburg Mining Company; 1950-01-01 to current/open; source msha-controller-operator-history