# Relationship history for MSHA mine 2500966

Current hierarchy: **Jack  Cole → Cole Sand & Gravel Company → PAGE PIT AND 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:** Jack  Cole → PAGE PIT AND PLANT; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Cole Sand & Gravel Company → PAGE PIT AND PLANT; 1980-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jack  Cole → Cole Sand & Gravel Company; 1980-04-01 to current/open; source msha-controller-operator-history