# Relationship history for MSHA mine 1503998

Current hierarchy: **Andalex Resources B V → West Ken Coal Corp → Center Mine**

- 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:** Center Coal Inc → Center Mine; 1950-01-01 to 1977-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Corum Otto → Center Mine; 1950-01-01 to 1977-10-31; source msha-controller-operator-history
- **controller_controls_operator:** Corum Otto → Center Coal Inc; 1950-01-01 to 1977-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Andalex Resources B V → Center Mine; 1977-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** West Ken Coal Corp → Center Mine; 1977-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Andalex Resources B V → West Ken Coal Corp; 1977-11-01 to current/open; source msha-controller-operator-history