# Relationship history for MSHA mine 3401918

Current hierarchy: **Don L  Shepherd → Don Shepherd → J & D Stone**

- 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:** Don Shepherd → J & D Stone; 2003-12-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Don L  Shepherd → J & D Stone; 2003-12-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Don L  Shepherd → Don Shepherd; 2003-12-08 to current/open; source msha-controller-operator-history