# Relationship history for MSHA mine 1505495

Current hierarchy: **Ricky D  Kirk; Jerry  Wells Jr → Hamilton Fuel Corp → No 6 Auger**

- 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

- **operator_operates_mine:** Hamilton Fuel Corp → No 6 Auger; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jerry  Wells Jr  et al → No 6 Auger; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jerry  Wells Jr  et al → Hamilton Fuel Corp; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ricky D  Kirk  et al → Hamilton Fuel Corp; 1950-01-01 to current/open; source msha-controller-operator-history