# Relationship history for MSHA mine 1515226

Current hierarchy: **Haynes Roy → Laural Branch Coal Company Inc → No 1 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:** Silver Creek Mining → No 1 Mine; 1985-05-01 to 1986-06-26; source msha-controller-operator-history
- **controller_controls_mine:** Slone Edward → No 1 Mine; 1985-05-01 to 1986-06-26; source msha-controller-operator-history
- **controller_controls_operator:** Slone Edward → Silver Creek Mining; 1985-05-01 to 1986-06-26; source msha-controller-operator-history
- **operator_operates_mine:** Laural Branch Coal Company Inc → No 1 Mine; 1986-06-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Haynes Roy → No 1 Mine; 1986-06-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Haynes Roy → Laural Branch Coal Company Inc; 1986-06-27 to current/open; source msha-controller-operator-history