# Relationship history for MSHA mine 5002120

Current hierarchy: **Kelly M  Heck; Jade A  Laughlin → McKinley Custom Crushing → Portable Crusher**

- 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:** McKinley Custom Crushing → Portable Crusher; 2026-04-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jade A  Laughlin et al → Portable Crusher; 2026-04-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jade A  Laughlin et al → McKinley Custom Crushing; 2026-04-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kelly M  Heck et al → McKinley Custom Crushing; 2026-04-08 to current/open; source msha-controller-operator-history