# Relationship history for MSHA mine 3200737

Current hierarchy: **Tony  Schirado → Schirado Excavation → SCHIRADO MINE**

- 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

- **controller_controls_mine:** Tony  Schirado → SCHIRADO MINE; 1984-06-25 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Schirado Excavation → SCHIRADO MINE; 1993-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tony  Schirado → Schirado Excavation; 1993-07-01 to current/open; source msha-controller-operator-history