# Relationship history for MSHA mine 4604944

Current hierarchy: **Campbell William A → Paul-Don Company Inc → Davisson Run Mine No 1 Strip**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Paul-Don Company Inc → Davisson Run Mine No 1 Strip; 1975-09-01 to 1979-11-04; source msha-controller-operator-history
- **controller_controls_mine:** Smith Paul L → Davisson Run Mine No 1 Strip; 1975-09-01 to 1979-11-04; source msha-controller-operator-history
- **controller_controls_operator:** Smith Paul L → Paul-Don Company Inc; 1975-09-01 to 1979-11-04; source msha-controller-operator-history
- **operator_operates_mine:** Paul-Don Company Inc → Davisson Run Mine No 1 Strip; 1979-11-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Campbell William A → Davisson Run Mine No 1 Strip; 1979-11-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Campbell William A → Paul-Don Company Inc; 1979-11-05 to current/open; source msha-controller-operator-history