# Relationship history for MSHA mine 2402244

Current hierarchy: **Roy  Acord → Mountain West Stone → HEARY CR.**

- 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:** Mountain West Stone → HEARY CR.; 2001-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Roy  Acord → HEARY CR.; 2001-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roy  Acord → Mountain West Stone; 2001-09-01 to current/open; source msha-controller-operator-history