# Relationship history for MSHA mine 3503775

Current hierarchy: **CRH PLC → RiverBend Materials → Allied Rock Portable Crusher #2**

- 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:** CRH PLC → Allied Rock Portable Crusher #2; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Allied Rock, L.L.C. → Allied Rock Portable Crusher #2; 2012-02-20 to 2025-11-06; source msha-controller-operator-history
- **controller_controls_mine:** Lou  Siegmund et al → Allied Rock Portable Crusher #2; 2012-02-20 to 2017-01-13; source msha-controller-operator-history
- **controller_controls_operator:** Lou  Siegmund et al → Allied Rock, L.L.C.; 2012-02-20 to 2017-01-13; source msha-controller-operator-history
- **controller_controls_operator:** Andrew  Siegmund et al → Allied Rock, L.L.C.; 2012-02-20 to 2017-01-13; source msha-controller-operator-history
- **controller_controls_mine:** Andrew L  Siegmund → Allied Rock Portable Crusher #2; 2017-01-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Andrew L  Siegmund → Allied Rock, L.L.C.; 2017-01-14 to 2025-11-06; source msha-controller-operator-history
- **operator_operates_mine:** RiverBend Materials → Allied Rock Portable Crusher #2; 2025-11-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → RiverBend Materials; 2025-11-07 to current/open; source msha-controller-operator-history