# Relationship history for MSHA mine 1508071

Current hierarchy: **Sunoco, Inc. → Ray Coal Company → No 9 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:** Whitaker Coal Corp & Jack E Whitaker-Trustee → No 9 Surface; 1950-01-01 to 1983-03-10; source msha-controller-operator-history
- **operator_operates_mine:** Ray Coal Company → No 9 Surface; 1975-01-01 to 1983-02-28; source msha-controller-operator-history
- **controller_controls_operator:** Whitaker Coal Corp & Jack E Whitaker-Trustee → Ray Coal Company; 1975-01-01 to 1983-02-28; source msha-controller-operator-history
- **operator_operates_mine:** Ray Coal Company → No 9 Surface; 1983-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Sunoco, Inc. → No 9 Surface; 1983-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sunoco, Inc. → Ray Coal Company; 1983-03-01 to current/open; source msha-controller-operator-history