# Relationship history for MSHA mine 3303670

Current hierarchy: **Poore Richard L → Basic Energy Inc → Basic Energy Mine**

- 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:** Basic Energy Inc → Basic Energy Mine; 1978-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Poore Richard L → Basic Energy Mine; 1978-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Poore Richard L → Basic Energy Inc; 1978-01-01 to current/open; source msha-controller-operator-history