# Relationship history for MSHA mine 1400879

Current hierarchy: **Eugene L  Meier; Vincent R  Meier → Meiers Ready Mix Inc. → MEIER'S READY MIX INC**

- 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:** Day Sand Company → MEIER'S READY MIX INC; 1950-01-01 to 1985-06-09; source msha-controller-operator-history
- **controller_controls_mine:** Edward E  Day → MEIER'S READY MIX INC; 1950-01-01 to 1985-06-09; source msha-controller-operator-history
- **controller_controls_operator:** Edward E  Day → Day Sand Company; 1950-01-01 to 1985-06-09; source msha-controller-operator-history
- **controller_controls_mine:** Eugene L  Meier et al → MEIER'S READY MIX INC; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Meiers Ready Mix Inc. → MEIER'S READY MIX INC; 1985-06-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Eugene L  Meier et al → Meiers Ready Mix Inc.; 1985-06-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vincent R  Meier et al → Meiers Ready Mix Inc.; 1985-06-10 to current/open; source msha-controller-operator-history