# Relationship history for MSHA mine 4703368

Current hierarchy: **Tim L  Becken; Thorwald L  Becken → Cemstone Ready Mix Inc → T- Rex  Pit**

- 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 → T- Rex  Pit; 1979-07-10 to 2024-09-30; source msha-controller-operator-history
- **operator_operates_mine:** Rexford Corporation-Mining Division → T- Rex  Pit; 2003-10-23 to 2007-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Thomas H  Rathbun → T- Rex  Pit; 2003-10-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thomas H  Rathbun → Rexford Corporation-Mining Division; 2003-10-23 to 2007-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Cemstone Ready Mix Inc → T- Rex  Pit; 2007-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hammond T Becken et al → Cemstone Ready Mix Inc; 2007-06-01 to 2024-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Tim L Becken et al → Cemstone Ready Mix Inc; 2007-06-01 to 2024-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Tim L  Becken et al → T- Rex  Pit; 2024-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tim L  Becken et al → Cemstone Ready Mix Inc; 2024-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thorwald L  Becken et al → Cemstone Ready Mix Inc; 2024-10-01 to current/open; source msha-controller-operator-history