# Relationship history for MSHA mine 3304091

Current hierarchy: **Stephen  Varkony; William M  Varkony → Varkony Mining Company → Tony Pit**

- 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

- **controller_controls_mine:** Stephen  Varkony et al → Tony Pit; 1974-08-14 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Varkony Mining Company → Tony Pit; 1987-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stephen  Varkony et al → Varkony Mining Company; 1987-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William M  Varkony et al → Varkony Mining Company; 1987-03-01 to current/open; source msha-controller-operator-history