# Relationship history for MSHA mine 3304288

Current hierarchy: **Chaffins Ronald E → Chaffins Mining → Chaffins Mine**

- 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:** Chaffins Mining → Chaffins Mine; 1992-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Chaffins Ronald E → Chaffins Mine; 1992-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Chaffins Ronald E → Chaffins Mining; 1992-12-01 to current/open; source msha-controller-operator-history