# Relationship history for MSHA mine 4202005

Current hierarchy: **Janice  Sackett; Larry  Jardine → Le Grand Johnson Construction Company → Portable Crusher D-Unit**

- 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:** Larry  Jardine et al → Portable Crusher D-Unit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Le Grand Johnson Construction Company → Portable Crusher D-Unit; 1987-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Larry  Jardine et al → Le Grand Johnson Construction Company; 1987-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Janice  Sackett et al → Le Grand Johnson Construction Company; 1987-04-01 to current/open; source msha-controller-operator-history