# Relationship history for MSHA mine 3500541

Current hierarchy: **Schuyler L  Van Wart → Central Rock & Redi-Mix → Central Rock & Redi-Mix**

- 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:** Crater Sand & Gravel, Inc. → Central Rock & Redi-Mix; 1950-01-01 to 2024-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Donald  Savage → Central Rock & Redi-Mix; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donald  Savage → Crater Sand & Gravel, Inc.; 1950-01-01 to 2024-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Central Rock & Redi-Mix → Central Rock & Redi-Mix; 2024-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Schuyler L  Van Wart → Central Rock & Redi-Mix; 2024-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Schuyler L  Van Wart → Central Rock & Redi-Mix; 2024-06-01 to current/open; source msha-controller-operator-history