# Relationship history for MSHA mine 1508286

Current hierarchy: **Cantrell Robert E → Joeboner Elkhorn Coal Company Inc → No 11-C**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Joeboner Elkhorn Coal Company Inc → No 11-C; 1975-04-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cantrell Robert E → No 11-C; 1975-04-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cantrell Robert E → Joeboner Elkhorn Coal Company Inc; 1975-04-29 to current/open; source msha-controller-operator-history