# Relationship history for MSHA mine 2302077

Current hierarchy: **Luke B Duffield → Duffield Aggregate of Missouri, LLC → Duffield Aggregate of Missouri**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Potosi Quarry Inc → Duffield Aggregate of Missouri; 1993-02-01 to 1997-01-27; source msha-controller-operator-history
- **controller_controls_mine:** Thomas M Beckham → Duffield Aggregate of Missouri; 1993-02-01 to 1997-01-27; source msha-controller-operator-history
- **controller_controls_operator:** Thomas M Beckham → Potosi Quarry Inc; 1993-02-01 to 1997-01-27; source msha-controller-operator-history
- **operator_operates_mine:** Washington County Quarry Inc → Duffield Aggregate of Missouri; 1997-01-28 to 2001-02-25; source msha-controller-operator-history
- **controller_controls_mine:** Robert  Ringo → Duffield Aggregate of Missouri; 1997-01-28 to 2001-02-25; source msha-controller-operator-history
- **controller_controls_operator:** Robert  Ringo → Washington County Quarry Inc; 1997-01-28 to 2001-02-25; source msha-controller-operator-history
- **operator_operates_mine:** Washington County Aggregates Inc. → Duffield Aggregate of Missouri; 2001-02-26 to 2023-04-02; source msha-controller-operator-history
- **controller_controls_mine:** Kelley C  Silvey → Duffield Aggregate of Missouri; 2001-02-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kelley C  Silvey → Washington County Aggregates Inc.; 2001-02-26 to 2023-04-02; source msha-controller-operator-history
- **operator_operates_mine:** Duffield Aggregates LLC → Duffield Aggregate of Missouri; 2023-04-03 to 2023-06-06; source msha-controller-operator-history
- **controller_controls_mine:** Luke B Duffield → Duffield Aggregate of Missouri; 2023-04-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Luke B Duffield → Duffield Aggregates LLC; 2023-04-03 to 2023-06-06; source msha-controller-operator-history
- **operator_operates_mine:** Duffield Aggregate of Missouri, LLC → Duffield Aggregate of Missouri; 2023-06-07 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Luke B Duffield → Duffield Aggregate of Missouri; 2023-06-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Luke B Duffield → Duffield Aggregate of Missouri, LLC; 2023-06-07 to current/open; source msha-controller-operator-history