# Relationship history for MSHA mine 4607641

Current hierarchy: **Carpenter M Wesley → Lazy Ace Coal Company Inc → 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:** Cooper William E → Mine No 1; 1981-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** West Leatherwood Mining → Mine No 1; 1988-12-01 to 1990-05-08; source msha-controller-operator-history
- **controller_controls_operator:** Cooper William E → West Leatherwood Mining; 1988-12-01 to 1990-05-08; source msha-controller-operator-history
- **operator_operates_mine:** Lazy Ace Coal Company Inc → Mine No 1; 1990-05-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Carpenter M Wesley → Mine No 1; 1990-05-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Carpenter M Wesley → Lazy Ace Coal Company Inc; 1990-05-09 to current/open; source msha-controller-operator-history