# Relationship history for MSHA mine 1506904

Current hierarchy: **Saiah D & F Engleman → B X Corp → No 2**

- 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:** Cargo Mining Company Inc → No 2; 1974-01-01 to 1983-12-28; source msha-controller-operator-history
- **controller_controls_mine:** Damron William E → No 2; 1974-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Damron William E → Cargo Mining Company Inc; 1974-01-01 to 1983-12-28; source msha-controller-operator-history
- **operator_operates_mine:** Sun-Ray Coal Corp → No 2; 1983-12-29 to 1985-03-04; source msha-controller-operator-history
- **controller_controls_mine:** Ball Roger L → No 2; 1983-12-29 to 1985-03-04; source msha-controller-operator-history
- **controller_controls_operator:** Ball Roger L → Sun-Ray Coal Corp; 1983-12-29 to 1985-03-04; source msha-controller-operator-history
- **controller_controls_mine:** Saiah D & F Engleman → No 2; 1984-03-12 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** B X Corp → No 2; 1985-03-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Saiah D & F Engleman → B X Corp; 1985-03-05 to current/open; source msha-controller-operator-history