# Relationship history for MSHA mine 2102674

Current hierarchy: **Tim L  Becken; Thorwald L  Becken → Cemstone Products Company → MN Portable Crusher 083 (A5753 Cone)**

- 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

- **operator_operates_mine:** Pinz Sand & Gravel Inc → MN Portable Crusher 083 (A5753 Cone); 1950-01-01 to 1995-06-29; source msha-controller-operator-history
- **controller_controls_mine:** Dennis  Pinz → MN Portable Crusher 083 (A5753 Cone); 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dennis  Pinz → Pinz Sand & Gravel Inc; 1950-01-01 to 1995-06-29; source msha-controller-operator-history
- **controller_controls_mine:** Hammond T Becken et al → MN Portable Crusher 083 (A5753 Cone); 1950-01-01 to 2025-08-17; source msha-controller-operator-history
- **operator_operates_mine:** Cemstone Products Company → MN Portable Crusher 083 (A5753 Cone); 1995-06-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hammond T Becken et al → Cemstone Products Company; 1995-06-30 to 2025-08-17; source msha-controller-operator-history
- **controller_controls_operator:** Tim L Becken et al → Cemstone Products Company; 1995-06-30 to 2025-08-17; source msha-controller-operator-history
- **controller_controls_mine:** Tim L  Becken et al → MN Portable Crusher 083 (A5753 Cone); 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
- **controller_controls_operator:** Thorwald L  Becken et al → Cemstone Products Company; 2025-08-18 to current/open; source msha-controller-operator-history