# Relationship history for MSHA mine 2103681

Current hierarchy: **Tim L  Becken; Thorwald L  Becken → Cemstone Products Co → Screening Plant #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:** Tim L Becken et al → Screening Plant #4; 1950-01-01 to 2025-08-17; source msha-controller-operator-history
- **operator_operates_mine:** Cemstone Products Co → Screening Plant #4; 2009-06-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tim L Becken et al → Cemstone Products Co; 2009-06-29 to 2025-08-17; source msha-controller-operator-history
- **controller_controls_operator:** Hammond T Becken et al → Cemstone Products Co; 2009-06-29 to 2025-08-17; source msha-controller-operator-history
- **controller_controls_mine:** Tim L  Becken et al → Screening Plant #4; 2025-08-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tim L  Becken et al → Cemstone Products Co; 2025-08-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thorwald L  Becken et al → Cemstone Products Co; 2025-08-18 to current/open; source msha-controller-operator-history