# Relationship history for MSHA mine 2003461

Current hierarchy: **James E  Zellar; Stan E  Zellar Jr → Hiawatha Shores Aggregates & Crushing → Mobile Crushing Plant**

- 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

- **operator_operates_mine:** Hiawatha Shores Aggregates & Crushing → Mobile Crushing Plant; 2012-10-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Barb  Gustafson et al → Mobile Crushing Plant; 2012-10-22 to 2020-05-30; source msha-controller-operator-history
- **controller_controls_operator:** Barb  Gustafson et al → Hiawatha Shores Aggregates & Crushing; 2012-10-22 to 2020-05-30; source msha-controller-operator-history
- **controller_controls_operator:** Stanley  Zellar et al → Hiawatha Shores Aggregates & Crushing; 2012-10-22 to 2020-05-30; source msha-controller-operator-history
- **controller_controls_mine:** James E  Zellar et al → Mobile Crushing Plant; 2020-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James E  Zellar et al → Hiawatha Shores Aggregates & Crushing; 2020-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stan E  Zellar Jr et al → Hiawatha Shores Aggregates & Crushing; 2020-08-01 to current/open; source msha-controller-operator-history