# Relationship history for MSHA mine 4703414

Current hierarchy: **Bret W  Schall → SCHAAL QUARRY → SCHAAL 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:** Schaal Quarry → SCHAAL QUARRY; 2005-04-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bret W  Schall → SCHAAL QUARRY; 2005-04-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bret W  Schall → Schaal Quarry; 2005-04-12 to current/open; source msha-controller-operator-history