# Relationship history for MSHA mine 1508782

Current hierarchy: **Bizzack John → Bizwil Inc → B-5 Surface**

- 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

- **controller_controls_mine:** Bizzack John → B-5 Surface; 1974-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Salyers Paul H → B-5 Surface; 1974-09-17 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Salyers Coal Company → B-5 Surface; 1975-09-02 to 1981-10-01; source msha-controller-operator-history
- **controller_controls_operator:** Salyers Paul H → Salyers Coal Company; 1975-09-02 to 1981-10-01; source msha-controller-operator-history
- **operator_operates_mine:** Bizwil Inc → B-5 Surface; 1981-10-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bizzack John → Bizwil Inc; 1981-10-02 to current/open; source msha-controller-operator-history