# Relationship history for MSHA mine 2401408

Current hierarchy: **Ry & K Development Company → Ry & K Development Company → Ry & K Mine & Mill**

- 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:** Ry & K Development Company → Ry & K Mine & Mill; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ry & K Development Company → Ry & K Mine & Mill; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ry & K Development Company → Ry & K Development Company; 1950-01-01 to current/open; source msha-controller-operator-history