# Relationship history for MSHA mine 0405550

Current hierarchy: **Larry W  Michael → Western Rock Co → Western Rock Co**

- 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:** Western Rock Co → Western Rock Co; 2003-02-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Larry W  Michael → Western Rock Co; 2003-02-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Larry W  Michael → Western Rock Co; 2003-02-10 to current/open; source msha-controller-operator-history