# Relationship history for MSHA mine 3500533

Current hierarchy: **E O S Inc → Ready Mix Ltd → MILTON-FREWATER**

- 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:** Ready Mix Sand & Gravel Company Inc → MILTON-FREWATER; 1950-01-01 to 1992-04-19; source msha-controller-operator-history
- **controller_controls_mine:** John P  O'Reilly → MILTON-FREWATER; 1950-01-01 to 1992-04-19; source msha-controller-operator-history
- **controller_controls_operator:** John P  O'Reilly → Ready Mix Sand & Gravel Company Inc; 1950-01-01 to 1992-04-19; source msha-controller-operator-history
- **controller_controls_mine:** E O S Inc Et Al → MILTON-FREWATER; 1992-01-13 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ready Mix Ltd → MILTON-FREWATER; 1992-04-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** E O S Inc Et Al → Ready Mix Ltd; 1992-04-20 to current/open; source msha-controller-operator-history