# Relationship history for MSHA mine 4001849

Current hierarchy: **Long Wendell J-A B Long Jr → Longwa Inc → No 4 Strip 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Long Wendell J-A B Long Jr Et Al → No 4 Strip Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Longwa Inc → No 4 Strip Mine; 1975-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Long Wendell J-A B Long Jr Et Al → Longwa Inc; 1975-09-01 to current/open; source msha-controller-operator-history