# Relationship history for MSHA mine 4607772

Current hierarchy: **Bills Eslie Jr → Construction Unlimited → Superior Stone**

- 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

- **operator_operates_mine:** Rock Products Inc → Superior Stone; 1989-10-01 to 1993-03-29; source msha-controller-operator-history
- **controller_controls_mine:** Currence Philip → Superior Stone; 1989-10-01 to 1993-03-29; source msha-controller-operator-history
- **controller_controls_operator:** Currence Philip → Rock Products Inc; 1989-10-01 to 1993-03-29; source msha-controller-operator-history
- **operator_operates_mine:** Construction Unlimited → Superior Stone; 1993-03-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bills Eslie Jr → Superior Stone; 1993-03-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bills Eslie Jr → Construction Unlimited; 1993-03-30 to current/open; source msha-controller-operator-history