# Relationship history for MSHA mine 0102026

Current hierarchy: **Comeens Hillard → C & I Coal Company Inc → Poplar Springs Mine**

- 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

- **controller_controls_mine:** Comeens Hillard → Poplar Springs Mine; 1976-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** C & I Coal Company Inc → Poplar Springs Mine; 1979-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Comeens Hillard → C & I Coal Company Inc; 1979-02-01 to current/open; source msha-controller-operator-history