# Relationship history for MSHA mine 4702537

Current hierarchy: **Tim L  Becken; Thorwald L  Becken → Cemstone Ready Mix → Spooner Pit 312**

- 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:** Milton D  Ostermann → Spooner Pit 312; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ostermann Sand & Gravel Inc → Spooner Pit 312; 1978-03-09 to 1984-02-16; source msha-controller-operator-history
- **controller_controls_operator:** Milton D  Ostermann → Ostermann Sand & Gravel Inc; 1978-03-09 to 1984-02-16; source msha-controller-operator-history
- **controller_controls_mine:** Tim L Becken et al → Spooner Pit 312; 1979-07-10 to 2024-09-30; source msha-controller-operator-history
- **operator_operates_mine:** Yellow River Supply Corp → Spooner Pit 312; 1984-02-17 to 2001-04-08; source msha-controller-operator-history
- **controller_controls_mine:** Dennis L  Nordstrand → Spooner Pit 312; 1984-02-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dennis L  Nordstrand → Yellow River Supply Corp; 1984-02-17 to 2001-04-08; source msha-controller-operator-history
- **operator_operates_mine:** Yellow River Supply Corp → Spooner Pit 312; 2001-04-09 to 2004-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Tim L Becken et al → Spooner Pit 312; 2001-04-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tim L Becken et al → Yellow River Supply Corp; 2001-04-09 to 2004-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Hammond T Becken et al → Yellow River Supply Corp; 2001-04-09 to 2004-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Cemstone Ready Mix → Spooner Pit 312; 2004-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tim L Becken et al → Cemstone Ready Mix; 2004-04-01 to 2024-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Hammond T Becken et al → Cemstone Ready Mix; 2004-04-01 to 2024-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Tim L  Becken et al → Spooner Pit 312; 2024-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tim L  Becken et al → Cemstone Ready Mix; 2024-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thorwald L  Becken et al → Cemstone Ready Mix; 2024-10-01 to current/open; source msha-controller-operator-history