# Relationship history for MSHA mine 0404850

Current hierarchy: **Paul H  Cleary Jr; Jim D  Grace → Materials Transport Services Inc → Yorba Linda**

- 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:** Paul H  Cleary Jr et al → Yorba Linda; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Materials Transport Services Inc → Yorba Linda; 1986-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Paul H  Cleary Jr et al → Materials Transport Services Inc; 1986-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jim D  Grace et al → Materials Transport Services Inc; 1986-11-01 to current/open; source msha-controller-operator-history