# Relationship history for MSHA mine 3502599

Current hierarchy: **Curl James M → Bend Aggregate & Paving Company → Hill Top 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Bend Aggregate & Paving Company → Hill Top Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Curl James M → Hill Top Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Curl James M → Bend Aggregate & Paving Company; 1950-01-01 to current/open; source msha-controller-operator-history