# Relationship history for MSHA mine 4703345

Current hierarchy: **Pavement Materials LLC → Fahrner Asphalt Sealers LLC → Hewitt  Robbins 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

- **controller_controls_mine:** Jerry  Fahrner → Hewitt  Robbins Crusher; 2001-12-19 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Fahrner Asphalt Sealers Inc. → Hewitt  Robbins Crusher; 2003-04-07 to 2007-02-23; source msha-controller-operator-history
- **controller_controls_operator:** Jerry  Fahrner → Fahrner Asphalt Sealers Inc.; 2003-04-07 to 2007-02-23; source msha-controller-operator-history
- **operator_operates_mine:** Fahrner Asphalt Sealers LLC → Hewitt  Robbins Crusher; 2007-02-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Pavement Materials LLC → Hewitt  Robbins Crusher; 2007-02-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Pavement Materials LLC → Fahrner Asphalt Sealers LLC; 2007-02-24 to current/open; source msha-controller-operator-history