# Relationship history for MSHA mine 3606487

Current hierarchy: **Harman Paul C → Paul C Harman → Paul C Harman Strip**

- 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:** Paul C Harman → Paul C Harman Strip; 1977-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Harman Paul C → Paul C Harman Strip; 1977-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harman Paul C → Paul C Harman; 1977-07-01 to current/open; source msha-controller-operator-history