# Relationship history for MSHA mine 2101642

Current hierarchy: **Kevin  Davidson → Davidson Ready Mix → Davidson Ready Mix**

- 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:** Concrete Inc → Davidson Ready Mix; 1950-01-01 to 1995-05-29; source msha-controller-operator-history
- **controller_controls_mine:** Jerome M  Dunlevy → Davidson Ready Mix; 1950-01-01 to 1995-05-29; source msha-controller-operator-history
- **controller_controls_operator:** Jerome M  Dunlevy → Concrete Inc; 1950-01-01 to 1995-05-29; source msha-controller-operator-history
- **operator_operates_mine:** Wells Concrete. → Davidson Ready Mix; 1995-05-30 to 2020-05-13; source msha-controller-operator-history
- **controller_controls_mine:** Wells Concrete → Davidson Ready Mix; 1995-05-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wells Concrete → Wells Concrete.; 1995-05-30 to 2020-05-13; source msha-controller-operator-history
- **operator_operates_mine:** Davidson Ready Mix → Davidson Ready Mix; 2020-05-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kevin  Davidson → Davidson Ready Mix; 2020-05-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kevin  Davidson → Davidson Ready Mix; 2020-05-14 to current/open; source msha-controller-operator-history