# Relationship history for MSHA mine 1505520

Current hierarchy: **Energy Management Corp → Energy Coal Income Partnership → Mine No 11**

- 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

- **operator_operates_mine:** Western Coal Corp → Mine No 11; 1950-01-01 to 1982-02-21; source msha-controller-operator-history
- **controller_controls_mine:** Western Coal Corp → Mine No 11; 1950-01-01 to 1982-02-21; source msha-controller-operator-history
- **controller_controls_operator:** Western Coal Corp → Western Coal Corp; 1950-01-01 to 1982-02-21; source msha-controller-operator-history
- **controller_controls_mine:** Energy Management Corp → Mine No 11; 1982-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Energy Coal Income Partnership → Mine No 11; 1982-02-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Energy Management Corp → Energy Coal Income Partnership; 1982-02-22 to current/open; source msha-controller-operator-history