# Relationship history for MSHA mine 2602520

Current hierarchy: **RRM Development Corporation; Mitsubishi Corp → Robertson's → Jean 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

- **controller_controls_mine:** Mitsubishi Corp → Jean Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** RRM Development Corporation et al → Jean Plant; 1995-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Four Star Aggregates LLC → Jean Plant; 2003-05-20 to 2006-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Bob  Vlach et al → Jean Plant; 2003-05-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bob  Vlach et al → Four Star Aggregates LLC; 2003-05-20 to 2006-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Barry R  Blanchard et al → Four Star Aggregates LLC; 2003-05-20 to 2006-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Service Rock Products → Jean Plant; 2006-07-01 to 2019-04-30; source msha-controller-operator-history
- **controller_controls_operator:** Mitsubishi Corp → Service Rock Products; 2006-07-01 to 2019-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Robertson's → Jean Plant; 2019-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** RRM Development Corporation et al → Robertson's; 2019-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mitsubishi Corp  et al → Robertson's; 2019-05-01 to current/open; source msha-controller-operator-history