# Relationship history for MSHA mine 0404538

Current hierarchy: **Richard T  Siri → S-Bar-S Quarry → S Bar S 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:** S-Bar-S Quarry → S Bar S Quarry; 1981-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Richard T  Siri → S Bar S Quarry; 1981-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard T  Siri → S-Bar-S Quarry; 1981-10-01 to current/open; source msha-controller-operator-history