# Relationship history for MSHA mine 2100539

Current hierarchy: **Tim L  Becken; Thorwald L  Becken → Cemstone Products Company → MN Portable Wash (A5764 Wash 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: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **controller_controls_mine:** Tim L Becken et al → MN Portable Wash (A5764 Wash Plant); 1950-01-01 to 2025-08-17; source msha-controller-operator-history
- **operator_operates_mine:** Carpenter & Kraft Ready Mix → MN Portable Wash (A5764 Wash Plant); 1950-01-01 to 1988-07-26; source msha-controller-operator-history
- **controller_controls_mine:** Frank M  Kraft → MN Portable Wash (A5764 Wash Plant); 1950-01-01 to 1988-07-26; source msha-controller-operator-history
- **controller_controls_operator:** Frank M  Kraft → Carpenter & Kraft Ready Mix; 1950-01-01 to 1988-07-26; source msha-controller-operator-history
- **operator_operates_mine:** Cemstone Products Company → MN Portable Wash (A5764 Wash Plant); 1988-07-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tim L Becken et al → Cemstone Products Company; 1988-07-27 to 2025-08-17; source msha-controller-operator-history
- **controller_controls_operator:** Hammond T Becken et al → Cemstone Products Company; 1988-07-27 to 2025-08-17; source msha-controller-operator-history
- **controller_controls_mine:** Thorwald L  Becken et al → MN Portable Wash (A5764 Wash Plant); 2025-08-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thorwald L  Becken et al → Cemstone Products Company; 2025-08-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tim L  Becken et al → Cemstone Products Company; 2025-08-18 to current/open; source msha-controller-operator-history