# Relationship history for MSHA mine 3607922

Current hierarchy: **Hayduk Raymond C Jr → Raymond Hayduk Jr → Hayduk Stone**

- 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:** Raymond Hayduk Jr → Hayduk Stone; 1987-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hayduk Raymond C Jr → Hayduk Stone; 1987-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hayduk Raymond C Jr → Raymond Hayduk Jr; 1987-09-01 to current/open; source msha-controller-operator-history