# Relationship history for MSHA mine 0102406

Current hierarchy: **Holder Leroy & William T Allen → Wheeler Hollow Coal Company Inc → Wheeler Hollow No 3 Mine**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Holder Leroy & William T Allen → Wheeler Hollow No 3 Mine; 1980-11-21 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Wheeler Hollow Coal Company Inc → Wheeler Hollow No 3 Mine; 1981-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Holder Leroy & William T Allen → Wheeler Hollow Coal Company Inc; 1981-10-01 to current/open; source msha-controller-operator-history