# Relationship history for MSHA mine 3606900

Current hierarchy: **Coulkitt Douglas → West Pine Construction Company Inc → Reilly Strip Mine No 1**

- 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:** Gaskin Oscar → Reilly Strip Mine No 1; 1975-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** West Pine Construction Company Inc → Reilly Strip Mine No 1; 1979-11-01 to 1983-01-09; source msha-controller-operator-history
- **controller_controls_operator:** Gaskin Oscar → West Pine Construction Company Inc; 1979-11-01 to 1983-01-09; source msha-controller-operator-history
- **operator_operates_mine:** West Pine Construction Company Inc → Reilly Strip Mine No 1; 1983-01-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Coulkitt Douglas → Reilly Strip Mine No 1; 1983-01-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Coulkitt Douglas → West Pine Construction Company Inc; 1983-01-10 to current/open; source msha-controller-operator-history