# Relationship history for MSHA mine 3606567

Current hierarchy: **Francis J  Hamilton; Ronald W  Hamilton → Fran Contracting Inc → Troutville Strip**

- 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:** Francis J  Hamilton et al → Troutville Strip; 1974-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Fran Contracting Inc → Troutville Strip; 1977-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Francis J  Hamilton et al → Fran Contracting Inc; 1977-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ronald W  Hamilton et al → Fran Contracting Inc; 1977-11-01 to current/open; source msha-controller-operator-history