# Relationship history for MSHA mine 4607612

Current hierarchy: **Charles Ron Eric → Kevron Contracting Inc → Crane Creek #1**

- 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:** Vaco Enterprises Inc → Crane Creek #1; 1988-11-01 to 1990-12-18; source msha-controller-operator-history
- **controller_controls_mine:** Clifton J W → Crane Creek #1; 1988-11-01 to 1990-12-18; source msha-controller-operator-history
- **controller_controls_operator:** Clifton J W → Vaco Enterprises Inc; 1988-11-01 to 1990-12-18; source msha-controller-operator-history
- **operator_operates_mine:** Kevron Contracting Inc → Crane Creek #1; 1990-12-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Charles Ron Eric → Crane Creek #1; 1990-12-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Charles Ron Eric → Kevron Contracting Inc; 1990-12-19 to current/open; source msha-controller-operator-history