# Relationship history for MSHA mine 2102413

Current hierarchy: **Tim L  Becken; Thorwald L  Becken → Cemstone Products Company → Aitkin Pit 087**

- 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:** Atkin Sand & Gravel Company → Aitkin Pit 087; 1950-01-01 to 1978-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Atkin Sand & Gravel Company → Aitkin Pit 087; 1950-01-01 to 1978-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Atkin Sand & Gravel Company → Atkin Sand & Gravel Company; 1950-01-01 to 1978-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Tim L Becken et al → Aitkin Pit 087; 1950-01-01 to 2025-08-17; source msha-controller-operator-history
- **operator_operates_mine:** Lamke Sand & Gravel → Aitkin Pit 087; 1978-06-01 to 1979-05-07; source msha-controller-operator-history
- **controller_controls_mine:** Darryl  L amke → Aitkin Pit 087; 1978-06-01 to 1979-05-07; source msha-controller-operator-history
- **controller_controls_operator:** Darryl  L amke → Lamke Sand & Gravel; 1978-06-01 to 1979-05-07; source msha-controller-operator-history
- **operator_operates_mine:** Aitkin Ready Mix → Aitkin Pit 087; 1979-05-08 to 1998-09-24; source msha-controller-operator-history
- **controller_controls_mine:** Dale R  Johnson → Aitkin Pit 087; 1979-05-08 to 1998-09-24; source msha-controller-operator-history
- **controller_controls_operator:** Dale R  Johnson → Aitkin Ready Mix; 1979-05-08 to 1998-09-24; source msha-controller-operator-history
- **operator_operates_mine:** Cemstone Products Company → Aitkin Pit 087; 1998-09-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tim L Becken et al → Cemstone Products Company; 1998-09-25 to 2025-08-17; source msha-controller-operator-history
- **controller_controls_operator:** Hammond T Becken et al → Cemstone Products Company; 1998-09-25 to 2025-08-17; source msha-controller-operator-history
- **controller_controls_mine:** Thorwald L  Becken et al → Aitkin Pit 087; 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