# Relationship history for MSHA mine 2002803

Current hierarchy: **Olan  Cole → Battle Creek Gravel Company Inc → ROLL CRUSHER PLANT**

- 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:** Olan  Cole → ROLL CRUSHER PLANT; 1981-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Battle Creek Gravel Company Inc → ROLL CRUSHER PLANT; 1988-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Olan  Cole → Battle Creek Gravel Company Inc; 1988-05-01 to current/open; source msha-controller-operator-history