# Relationship history for MSHA mine 1401623

Current hierarchy: **Jeanette  Pfannenstiel → J Corp → Portable Rock 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Jeanette  Pfannenstiel → Portable Rock Crusher; 2000-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** J Corp → Portable Rock Crusher; 2002-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jeanette  Pfannenstiel → J Corp; 2002-11-01 to current/open; source msha-controller-operator-history