# Relationship history for MSHA mine 4300307

Current hierarchy: **Jeffrey N  Harrison → Western Slate, Inc. → EAGLE 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

- **controller_controls_mine:** William J  Billow → EAGLE QUARRY; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Green Mountain Slate Inc → EAGLE QUARRY; 1979-01-01 to 2019-03-27; source msha-controller-operator-history
- **controller_controls_operator:** William J  Billow → Green Mountain Slate Inc; 1979-01-01 to 2019-03-27; source msha-controller-operator-history
- **controller_controls_mine:** Jeffrey N  Harrison → EAGLE QUARRY; 1991-05-25 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Western Slate, Inc. → EAGLE QUARRY; 2019-03-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jeffrey N  Harrison → Western Slate, Inc.; 2019-03-28 to current/open; source msha-controller-operator-history