# Relationship history for MSHA mine 4800774

Current hierarchy: **Colas S A → Simon Contractors → WASH 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Read Readymix Company → WASH PLANT; 1950-01-01 to 1982-10-18; source msha-controller-operator-history
- **controller_controls_mine:** Read Readymix Company → WASH PLANT; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Read Readymix Company → Read Readymix Company; 1950-01-01 to 1982-10-18; source msha-controller-operator-history
- **controller_controls_mine:** James E. Simon Co., A Wyoming Corp → WASH PLANT; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** James E Simon Company → WASH PLANT; 1982-10-19 to 1995-01-25; source msha-controller-operator-history
- **controller_controls_operator:** James E. Simon Co., A Wyoming Corp → James E Simon Company; 1982-10-19 to 1995-01-25; source msha-controller-operator-history
- **operator_operates_mine:** Simon Contractors → WASH PLANT; 1995-01-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Colas S A → WASH PLANT; 1995-01-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Colas S A → Simon Contractors; 1995-01-26 to current/open; source msha-controller-operator-history