# Relationship history for MSHA mine 3401065

Current hierarchy: **Wheatley Virgil → B & M Ready-Mix Inc → Cimarron Materials Incorporated**

- 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

- **operator_operates_mine:** George Kopf Sand → Cimarron Materials Incorporated; 1950-01-01 to 1978-10-17; source msha-controller-operator-history
- **controller_controls_mine:** Kopf George → Cimarron Materials Incorporated; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kopf George → George Kopf Sand; 1950-01-01 to 1978-10-17; source msha-controller-operator-history
- **operator_operates_mine:** B & M Ready-Mix Inc → Cimarron Materials Incorporated; 1978-10-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Wheatley Virgil → Cimarron Materials Incorporated; 1978-10-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wheatley Virgil → B & M Ready-Mix Inc; 1978-10-18 to current/open; source msha-controller-operator-history