# Relationship history for MSHA mine 3607339

Current hierarchy: **Durkin Edward E → Alderney Coal Company Inc → Alderney Breaker**

- 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:** Mullin Joseph → Alderney Breaker; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Shamrock Coal Company Inc → Alderney Breaker; 1982-07-01 to 1985-08-07; source msha-controller-operator-history
- **controller_controls_operator:** Mullin Joseph → Shamrock Coal Company Inc; 1982-07-01 to 1985-08-07; source msha-controller-operator-history
- **operator_operates_mine:** Alderney Coal Company Inc → Alderney Breaker; 1985-08-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Durkin Edward E → Alderney Breaker; 1985-08-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Durkin Edward E → Alderney Coal Company Inc; 1985-08-08 to current/open; source msha-controller-operator-history