# Relationship history for MSHA mine 4003651

Current hierarchy: **Francisco  Diego → C Wall Stone LLC → Houston Quarry**

- 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:** C Wall Stone LLC → Houston Quarry; 2026-05-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Francisco  Diego → Houston Quarry; 2026-05-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Francisco  Diego → C Wall Stone LLC; 2026-05-14 to current/open; source msha-controller-operator-history