# Relationship history for MSHA mine 2302192

Current hierarchy: **Walter A  Dillon → W A Dillon Mining → SOETE SITE TOMNITZ SITE**

- 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:** W A Dillon Mining → SOETE SITE TOMNITZ SITE; 1999-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Walter A  Dillon → SOETE SITE TOMNITZ SITE; 1999-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Walter A  Dillon → W A Dillon Mining; 1999-04-01 to current/open; source msha-controller-operator-history