# Relationship history for MSHA mine 0503857

Current hierarchy: **Gavell Carolyn → Gavell Excavating → Gavell Excavating**

- 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:** Eastwood & Gavell → Gavell Excavating; 1983-06-01 to 1985-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Gavell Dave & Ron Eastwood → Gavell Excavating; 1983-06-01 to 1985-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Gavell Dave & Ron Eastwood → Eastwood & Gavell; 1983-06-01 to 1985-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Gavell Excavating → Gavell Excavating; 1985-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gavell Carolyn → Gavell Excavating; 1985-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gavell Carolyn → Gavell Excavating; 1985-04-01 to current/open; source msha-controller-operator-history