# Relationship history for MSHA mine 2500928

Current hierarchy: **Lee (Vance)  Jeffres → Jeffres Sand & Gravel Inc → Jeffres #2**

- 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:** Lee (Vance)  Jeffres → Jeffres #2; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gary  Hyde → Jeffres #2; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hyde Rock & Gravel Company → Jeffres #2; 1979-01-01 to 1985-05-01; source msha-controller-operator-history
- **controller_controls_operator:** Gary  Hyde → Hyde Rock & Gravel Company; 1979-01-01 to 1985-05-01; source msha-controller-operator-history
- **operator_operates_mine:** Jeffres Sand & Gravel Inc → Jeffres #2; 1985-05-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lee (Vance)  Jeffres → Jeffres Sand & Gravel Inc; 1985-05-02 to current/open; source msha-controller-operator-history