# Relationship history for MSHA mine 3503861

Current hierarchy: **Mathy Construction Company → Taylor Northwest LLC → Portable Crusher 3**

- 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:** Lorri  Taylor et al → Portable Crusher 3; 2011-03-10 to 2019-10-30; source msha-controller-operator-history
- **controller_controls_mine:** Mathy Construction Company → Portable Crusher 3; 2019-10-31 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Taylor Northwest LLC → Portable Crusher 3; 2021-09-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lorri  Taylor et al → Taylor Northwest LLC; 2021-09-07 to 2019-10-30; source msha-controller-operator-history
- **controller_controls_operator:** Todd  Taylor et al → Taylor Northwest LLC; 2021-09-07 to 2019-10-30; source msha-controller-operator-history
- **controller_controls_operator:** Mathy Construction Company → Taylor Northwest LLC; 2021-09-07 to current/open; source msha-controller-operator-history