# Relationship history for MSHA mine 3609144

Current hierarchy: **Jerry W  Lucas Jr → R & K Coal Co. → Buck Mt. Slope**

- 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:** Jerry W  Lucas Jr → Buck Mt. Slope; 1987-11-18 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** R & K Coal Co. → Buck Mt. Slope; 2003-05-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jerry W  Lucas Jr → R & K Coal Co.; 2003-05-13 to current/open; source msha-controller-operator-history