# Relationship history for MSHA mine 1508585

Current hierarchy: **Trivette Charles F → Black Triangle Coal Company Inc → No 11 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:** Trivette Charles F → No 11 Surface; 1974-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Double R & H Coal Co → No 11 Surface; 1975-01-01 to 1977-03-14; source msha-controller-operator-history
- **controller_controls_mine:** Holbrook Eddie & Kermit Rutherford → No 11 Surface; 1975-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Holbrook Eddie & Kermit Rutherford → Double R & H Coal Co; 1975-01-01 to 1977-03-14; source msha-controller-operator-history
- **operator_operates_mine:** Black Triangle Coal Company Inc → No 11 Surface; 1977-03-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Trivette Charles F → Black Triangle Coal Company Inc; 1977-03-15 to current/open; source msha-controller-operator-history