# Relationship history for MSHA mine 1100244

Current hierarchy: **Shakespeare Oil Company Inc → Iola Quarry Inc → Brush Creek 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

- **controller_controls_mine:** Shakespeare Oil Company Inc → Brush Creek Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** S & V Stone Quarry → Brush Creek Quarry; 1950-01-01 to 1995-10-02; source msha-controller-operator-history
- **controller_controls_mine:** Winter Stanley & Virgil → Brush Creek Quarry; 1950-01-01 to 1995-10-02; source msha-controller-operator-history
- **controller_controls_operator:** Winter Stanley & Virgil → S & V Stone Quarry; 1950-01-01 to 1995-10-02; source msha-controller-operator-history
- **operator_operates_mine:** Iola Quarry Inc → Brush Creek Quarry; 1995-10-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Shakespeare Oil Company Inc → Iola Quarry Inc; 1995-10-03 to current/open; source msha-controller-operator-history