# Relationship history for MSHA mine 2302408

Current hierarchy: **Mark  Magruder → Magruder Limestone Co Inc → CEC Plant #2-Ser #99515**

- 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:** Mark  Magruder → CEC Plant #2-Ser #99515; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Magruder Limestone Co Inc → CEC Plant #2-Ser #99515; 2010-05-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mark  Magruder → Magruder Limestone Co Inc; 2010-05-24 to current/open; source msha-controller-operator-history