# Relationship history for MSHA mine 3303628

Current hierarchy: **Smith Daniel J & Ronald L → Arrow Head Energy Inc → Arrow Head 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:** Arrow Head Energy Inc → Arrow Head Strip; 1977-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Smith Daniel J & Ronald L → Arrow Head Strip; 1977-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Smith Daniel J & Ronald L → Arrow Head Energy Inc; 1977-07-01 to current/open; source msha-controller-operator-history