# Relationship history for MSHA mine 3302596

Current hierarchy: **Dale R  Sidwell → Sidwell Brothers Inc → Sidwell Quarry #3**

- 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:** D & K Construction Inc → Sidwell Quarry #3; 1950-01-01 to 1983-02-28; source msha-controller-operator-history
- **controller_controls_mine:** Prewett J L → Sidwell Quarry #3; 1950-01-01 to 1983-02-28; source msha-controller-operator-history
- **controller_controls_operator:** Prewett J L → D & K Construction Inc; 1950-01-01 to 1983-02-28; source msha-controller-operator-history
- **controller_controls_mine:** Dale R  Sidwell et al → Sidwell Quarry #3; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sidwell Brothers Inc → Sidwell Quarry #3; 1983-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dale R  Sidwell et al → Sidwell Brothers Inc; 1983-03-01 to current/open; source msha-controller-operator-history