# Relationship history for MSHA mine 1508567

Current hierarchy: **Tussey Frank → P & G Coal Company Inc → Mine No 4**

- 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:** Anderson Clinis & Hillard → Mine No 4; 1974-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Bill D Branch Coal Company Inc → Mine No 4; 1975-07-01 to 1981-02-26; source msha-controller-operator-history
- **controller_controls_operator:** Anderson Clinis & Hillard → Bill D Branch Coal Company Inc; 1975-07-01 to 1981-02-26; source msha-controller-operator-history
- **operator_operates_mine:** P & G Coal Company Inc → Mine No 4; 1981-02-27 to 1983-03-08; source msha-controller-operator-history
- **controller_controls_mine:** Haywood Billy H → Mine No 4; 1981-02-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Haywood Billy H → P & G Coal Company Inc; 1981-02-27 to 1983-03-08; source msha-controller-operator-history
- **operator_operates_mine:** P & G Coal Company Inc → Mine No 4; 1983-03-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Tussey Frank → Mine No 4; 1983-03-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tussey Frank → P & G Coal Company Inc; 1983-03-09 to current/open; source msha-controller-operator-history