# Relationship history for MSHA mine 3301526

Current hierarchy: **CRH PLC → Stoneco Inc. → Jefferson Materials Co**

- 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

- **controller_controls_mine:** Johnson S E Companies Inc → Jefferson Materials Co; 1950-01-01 to 2003-06-15; source msha-controller-operator-history
- **operator_operates_mine:** Jefferson Materials Company → Jefferson Materials Co; 1950-01-01 to 2000-04-05; source msha-controller-operator-history
- **controller_controls_mine:** Charles G  Rauh → Jefferson Materials Co; 1950-01-01 to 2000-04-05; source msha-controller-operator-history
- **controller_controls_operator:** Charles G  Rauh → Jefferson Materials Company; 1950-01-01 to 2000-04-05; source msha-controller-operator-history
- **operator_operates_mine:** Jefferson Materials Co → Jefferson Materials Co; 2000-04-06 to 2021-01-01; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Jefferson Materials Co; 2000-04-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Jefferson Materials Co; 2000-04-06 to 2021-01-01; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Jefferson Materials Co; 2003-06-16 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Stoneco Inc. → Jefferson Materials Co; 2021-01-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Johnson S E Companies Inc → Stoneco Inc.; 2021-01-02 to 2003-06-15; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Stoneco Inc.; 2021-01-02 to current/open; source msha-controller-operator-history