# Relationship history for MSHA mine 0101720

Current hierarchy: **Fortner James E → White Oak Mining Company Inc → White Oak Washer**

- 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:** Hallmark Fred H → White Oak Washer; 1977-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hallmark & Son Coal Company → White Oak Washer; 1977-07-01 to 1988-06-01; source msha-controller-operator-history
- **controller_controls_operator:** Hallmark Fred H → Hallmark & Son Coal Company; 1977-07-01 to 1988-06-01; source msha-controller-operator-history
- **controller_controls_mine:** Fortner James E → White Oak Washer; 1984-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** White Oak Mining Company Inc → White Oak Washer; 1988-06-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fortner James E → White Oak Mining Company Inc; 1988-06-02 to current/open; source msha-controller-operator-history