# Relationship history for MSHA mine 0504089

Current hierarchy: **Church Ray K → Ex-Terra Corp Ii → Helen M S**

- 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:** Ex-Terra Corp Ii → Helen M S; 1985-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Church Ray K → Helen M S; 1985-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Church Ray K → Ex-Terra Corp Ii; 1985-09-01 to current/open; source msha-controller-operator-history