# Relationship history for MSHA mine 2602490

Current hierarchy: **Neil  Jacobson → Custom Crushing Inc. → Portable #1**

- 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:** Neil  Jacobson → Portable #1; 1996-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Custom Crushing Inc. → Portable #1; 2002-02-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Neil  Jacobson → Custom Crushing Inc.; 2002-02-08 to current/open; source msha-controller-operator-history