# Relationship history for MSHA mine 0502771

Current hierarchy: **General Atomics Uranium Resources → Cotter Corp → C-SR-13a**

- 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:** Commonwealth Edison Company → C-SR-13a; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Blake Mining Company → C-SR-13a; 1950-01-01 to 1984-08-07; source msha-controller-operator-history
- **controller_controls_mine:** Blake David E → C-SR-13a; 1950-01-01 to 1998-01-26; source msha-controller-operator-history
- **controller_controls_operator:** Blake David E → Blake Mining Company; 1950-01-01 to 1984-08-07; source msha-controller-operator-history
- **operator_operates_mine:** Cotter Corp → C-SR-13a; 1984-08-08 to 2000-02-17; source msha-controller-operator-history
- **controller_controls_operator:** Commonwealth Edison Company → Cotter Corp; 1984-08-08 to 2000-02-17; source msha-controller-operator-history
- **operator_operates_mine:** Cotter Corp → C-SR-13a; 2000-02-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** General Atomics Uranium Resources → C-SR-13a; 2000-02-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** General Atomics Uranium Resources → Cotter Corp; 2000-02-18 to current/open; source msha-controller-operator-history