# Relationship history for MSHA mine 3609247

Current hierarchy: **Kevin J  Shepard → Kevin J. Shepard → Shepard 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

- **operator_operates_mine:** Kevin J. Shepard → Shepard Quarry; 2004-04-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kevin J  Shepard → Shepard Quarry; 2004-04-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kevin J  Shepard → Kevin J. Shepard; 2004-04-26 to current/open; source msha-controller-operator-history