# Relationship history for MSHA mine 2600492

Current hierarchy: **MCC Development Corporation → Nevada Ready Mix Corp → VEGAS VALLEY PLANT**

- 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:** Nevada Ready Mix → VEGAS VALLEY PLANT; 1950-01-01 to 1988-11-30; source msha-controller-operator-history
- **controller_controls_mine:** Stewart Harold & Neil Et Al → VEGAS VALLEY PLANT; 1950-01-01 to 1988-11-30; source msha-controller-operator-history
- **controller_controls_operator:** Stewart Harold & Neil Et Al → Nevada Ready Mix; 1950-01-01 to 1988-11-30; source msha-controller-operator-history
- **operator_operates_mine:** Nevada Ready Mix Corp → VEGAS VALLEY PLANT; 1988-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mitsubishi Corp → VEGAS VALLEY PLANT; 1988-12-01 to 2023-02-13; source msha-controller-operator-history
- **controller_controls_operator:** Mitsubishi Corp → Nevada Ready Mix Corp; 1988-12-01 to 2023-02-13; source msha-controller-operator-history
- **controller_controls_mine:** MCC Development Corporation → VEGAS VALLEY PLANT; 2023-02-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** MCC Development Corporation → Nevada Ready Mix Corp; 2023-02-14 to current/open; source msha-controller-operator-history