# Relationship history for MSHA mine 1300747

Current hierarchy: **Tim L  Becken; Thorwald L  Becken → Cemstone Products Company → Ocheyedan Sand &Gravel**

- 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

- **operator_operates_mine:** NorthWest Ready-Mix Concrete, Inc. → Ocheyedan Sand &Gravel; 1950-01-01 to 2025-08-17; source msha-controller-operator-history
- **controller_controls_mine:** Tim L Becken et al → Ocheyedan Sand &Gravel; 1950-01-01 to 2025-08-17; source msha-controller-operator-history
- **controller_controls_mine:** Marie  Stewart → Ocheyedan Sand &Gravel; 1950-01-01 to 2014-07-22; source msha-controller-operator-history
- **controller_controls_operator:** Marie  Stewart → NorthWest Ready-Mix Concrete, Inc.; 1950-01-01 to 2014-07-22; source msha-controller-operator-history
- **controller_controls_mine:** Kent  Stewart → Ocheyedan Sand &Gravel; 2014-07-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kent  Stewart → NorthWest Ready-Mix Concrete, Inc.; 2014-07-23 to 2025-08-17; source msha-controller-operator-history
- **operator_operates_mine:** Cemstone Products Company → Ocheyedan Sand &Gravel; 2025-08-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Tim L  Becken et al → Ocheyedan Sand &Gravel; 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
- **controller_controls_operator:** Tim L Becken et al → Cemstone Products Company; 2025-08-18 to 2025-08-17; source msha-controller-operator-history
- **controller_controls_operator:** Hammond T Becken et al → Cemstone Products Company; 2025-08-18 to 2025-08-17; source msha-controller-operator-history