# Relationship history for MSHA mine 1512590

Current hierarchy: **Balena Joseph → Airco Mining Company Corp → No 2 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:** Frank Crawford Coal Company → No 2 Mine; 1980-10-01 to 1981-05-11; source msha-controller-operator-history
- **controller_controls_mine:** Crawford Frank → No 2 Mine; 1980-10-01 to 1981-05-11; source msha-controller-operator-history
- **controller_controls_operator:** Crawford Frank → Frank Crawford Coal Company; 1980-10-01 to 1981-05-11; source msha-controller-operator-history
- **operator_operates_mine:** J & H Coal Company → No 2 Mine; 1981-05-12 to 1981-10-08; source msha-controller-operator-history
- **controller_controls_mine:** Jones Jesse Et Al → No 2 Mine; 1981-05-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jones Jesse Et Al → J & H Coal Company; 1981-05-12 to 1981-10-08; source msha-controller-operator-history
- **controller_controls_mine:** Balena Joseph → No 2 Mine; 1981-09-08 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Airco Mining Company Corp → No 2 Mine; 1981-10-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Balena Joseph → Airco Mining Company Corp; 1981-10-09 to current/open; source msha-controller-operator-history