# Relationship history for MSHA mine 0103545

Current hierarchy: **Ronald H  Davis; Ronald T  Davis; Rhonda D  Robinson; Christopher H  Dav → DAVIS MATERIALS, INC. → VANCE QUARRY**

- 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:** DAVIS MATERIALS, INC. → VANCE QUARRY; 2021-01-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ronald T  Davis et al → VANCE QUARRY; 2021-01-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ronald T  Davis et al → DAVIS MATERIALS, INC.; 2021-01-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rhonda D  Robinson et al → DAVIS MATERIALS, INC.; 2021-01-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Christopher H  Davis et al → DAVIS MATERIALS, INC.; 2021-01-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ronald H  Davis et al → DAVIS MATERIALS, INC.; 2021-01-05 to current/open; source msha-controller-operator-history