# Relationship history for MSHA mine 4105851

Current hierarchy: **Matthew  Hansen; Sonny  Heittola → SOLID ROCK CRUSHING, LLC → America #4**

- 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:** Sonny  Heittola et al → America #4; 2019-02-08 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** SOLID ROCK CRUSHING, LLC → America #4; 2026-02-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sonny  Heittola et al → SOLID ROCK CRUSHING, LLC; 2026-02-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Matthew  Hansen et al → SOLID ROCK CRUSHING, LLC; 2026-02-25 to current/open; source msha-controller-operator-history