# Relationship history for MSHA mine 1505157

Current hierarchy: **Saiah D & F Engleman → B X Corp → B X Corp Tipple**

- 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

- **operator_operates_mine:** Boldman Fuel Company Inc → B X Corp Tipple; 1950-01-01 to 1976-12-20; source msha-controller-operator-history
- **controller_controls_mine:** Justice Joseph A → B X Corp Tipple; 1950-01-01 to 1976-12-20; source msha-controller-operator-history
- **controller_controls_operator:** Justice Joseph A → Boldman Fuel Company Inc; 1950-01-01 to 1976-12-20; source msha-controller-operator-history
- **operator_operates_mine:** Lower Hurricane Mining Company Inc → B X Corp Tipple; 1976-12-21 to 1984-03-11; source msha-controller-operator-history
- **controller_controls_mine:** Lower Hurricane Mining Company Inc → B X Corp Tipple; 1976-12-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lower Hurricane Mining Company Inc → Lower Hurricane Mining Company Inc; 1976-12-21 to 1984-03-11; source msha-controller-operator-history
- **operator_operates_mine:** B X Corp → B X Corp Tipple; 1984-03-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Saiah D & F Engleman → B X Corp Tipple; 1984-03-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Saiah D & F Engleman → B X Corp; 1984-03-12 to current/open; source msha-controller-operator-history