# Relationship history for MSHA mine 0202519

Current hierarchy: **On An On Corp → On An On Corp → On An On Corporation**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** On An On Corp → On An On Corporation; 1990-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** On An On Corp → On An On Corporation; 1990-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** On An On Corp → On An On Corp; 1990-04-01 to current/open; source msha-controller-operator-history