# Relationship history for MSHA mine 3608628

Current hierarchy: **Kerry L  Mears → Mears Enterprises Inc → Ondo 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Kerry L  Mears → Ondo Mine; 1980-01-31 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mears Enterprises Inc → Ondo Mine; 1997-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kerry L  Mears → Mears Enterprises Inc; 1997-03-01 to current/open; source msha-controller-operator-history