# Relationship history for MSHA mine 4300835

Current hierarchy: **Eric  Martin; Vergil  Martin → KURTZ EXCAVATING → GEER ROAD**

- 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:** Kurtz Excavating → GEER ROAD; 2025-09-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Eric  Martin et al → GEER ROAD; 2025-09-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Eric  Martin et al → Kurtz Excavating; 2025-09-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vergil  Martin et al → Kurtz Excavating; 2025-09-11 to current/open; source msha-controller-operator-history