# Relationship history for MSHA mine 2104026

Current hierarchy: **Tim L  Becken; Thorwald L  Becken → Cemstone Products Company → 1840WP Portable**

- 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 → 1840WP Portable; 1950-01-01 to 2025-08-17; source msha-controller-operator-history
- **operator_operates_mine:** Crow River Construction → 1840WP Portable; 2022-03-30 to 2025-08-24; source msha-controller-operator-history
- **controller_controls_mine:** Kraig  Hanson → 1840WP Portable; 2022-03-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kraig  Hanson → Crow River Construction; 2022-03-30 to 2025-08-24; source msha-controller-operator-history
- **controller_controls_mine:** Thorwald L  Becken et al → 1840WP Portable; 2025-08-18 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Cemstone Products Company → 1840WP Portable; 2025-08-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thorwald L  Becken et al → Cemstone Products Company; 2025-08-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tim L  Becken et al → Cemstone Products Company; 2025-08-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hammond T Becken et al → Cemstone Products Company; 2025-08-25 to 2025-08-17; source msha-controller-operator-history
- **controller_controls_operator:** Tim L Becken et al → Cemstone Products Company; 2025-08-25 to 2025-08-17; source msha-controller-operator-history