# Relationship history for MSHA mine 1510403

Current hierarchy: **Haywood Billy H → P & G Coal Company Inc → No 3 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

- **controller_controls_mine:** George  Newsom → No 3 Mine; 1974-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** P & G Coal Company Inc → No 3 Mine; 1977-05-01 to 1981-02-26; source msha-controller-operator-history
- **controller_controls_operator:** George  Newsom → P & G Coal Company Inc; 1977-05-01 to 1981-02-26; source msha-controller-operator-history
- **operator_operates_mine:** P & G Coal Company Inc → No 3 Mine; 1981-02-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Haywood Billy H → No 3 Mine; 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 current/open; source msha-controller-operator-history