# Relationship history for MSHA mine 2902025

Current hierarchy: **Joel  Bonnell → Bonnell Sand & Gravel → Harkey Pit**

- 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:** David  Bonnell → Harkey Pit; 1950-01-01 to 2012-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Bonnell Sand & Gravel → Harkey Pit; 1988-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David  Bonnell → Bonnell Sand & Gravel; 1988-03-01 to 2012-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Joel  Bonnell → Harkey Pit; 2013-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joel  Bonnell → Bonnell Sand & Gravel; 2013-01-01 to current/open; source msha-controller-operator-history