# Relationship history for MSHA mine 1510851

Current hierarchy: **Caines Rell → Circle C Coal Co Inc → No 4 Surface**

- 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:** Caines Rell → No 4 Surface; 1975-02-18 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Circle C Coal Co Inc → No 4 Surface; 1977-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Caines Rell → Circle C Coal Co Inc; 1977-10-01 to current/open; source msha-controller-operator-history