# Relationship history for MSHA mine 4703676

Current hierarchy: **Tim L  Becken; Thorwald L  Becken → Cemstone Ready Mix → Portable Wash Plant #5**

- 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:** Hammond T Becken et al → Portable Wash Plant #5; 1979-07-10 to 2024-09-30; source msha-controller-operator-history
- **operator_operates_mine:** Cemstone Ready Mix → Portable Wash Plant #5; 2012-10-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hammond T Becken et al → Cemstone Ready Mix; 2012-10-23 to 2024-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Tim L Becken et al → Cemstone Ready Mix; 2012-10-23 to 2024-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Thorwald L  Becken et al → Portable Wash Plant #5; 2024-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thorwald L  Becken et al → Cemstone Ready Mix; 2024-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tim L  Becken et al → Cemstone Ready Mix; 2024-10-01 to current/open; source msha-controller-operator-history