# Relationship history for MSHA mine 3503233

Current hierarchy: **Dan E  Hooker → Harney Rock & Paving Company → Crusher #2**

- 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:** Dan E  Hooker → Crusher #2; 1979-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Harney Rock & Paving Company → Crusher #2; 1985-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dan E  Hooker → Harney Rock & Paving Company; 1985-05-01 to current/open; source msha-controller-operator-history