# Relationship history for MSHA mine 2401806

Current hierarchy: **Barnard Construction Company, Inc → Barnard Construction Company Inc → Cazier 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:** Barnard Construction Company Inc → Cazier Quarry; 1985-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Timothy  Barnard → Cazier Quarry; 1985-10-01 to 2026-07-22; source msha-controller-operator-history
- **controller_controls_operator:** Timothy  Barnard → Barnard Construction Company Inc; 1985-10-01 to 2026-07-22; source msha-controller-operator-history
- **controller_controls_mine:** Barnard Construction Company, Inc → Cazier Quarry; 2026-07-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Barnard Construction Company, Inc → Barnard Construction Company Inc; 2026-07-23 to current/open; source msha-controller-operator-history