# Relationship history for MSHA mine 1100214

Current hierarchy: **Callender Construction Company Inc, ESOP → Callender Construction Company Inc → THOMAS 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:** Callender Construction Company Inc → THOMAS QUARRY; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bruce  Callender → THOMAS QUARRY; 1950-01-01 to 2023-01-01; source msha-controller-operator-history
- **controller_controls_operator:** Bruce  Callender → Callender Construction Company Inc; 1950-01-01 to 2023-01-01; source msha-controller-operator-history
- **controller_controls_mine:** Terry  McEuen et al → THOMAS QUARRY; 2023-01-02 to 2025-01-02; source msha-controller-operator-history
- **controller_controls_operator:** Terry  McEuen et al → Callender Construction Company Inc; 2023-01-02 to 2025-01-02; source msha-controller-operator-history
- **controller_controls_operator:** William Oscar Turnbull et al → Callender Construction Company Inc; 2023-01-02 to 2025-01-02; source msha-controller-operator-history
- **controller_controls_mine:** Callender Construction Company Inc, ESOP → THOMAS QUARRY; 2025-01-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Callender Construction Company Inc, ESOP → Callender Construction Company Inc; 2025-01-03 to current/open; source msha-controller-operator-history