# Relationship history for MSHA mine 3606069

Current hierarchy: **Thomas M  Boyle → Mon River Dock Company → No 1 Strip Fitzwater 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Mon River Dock Company → No 1 Strip Fitzwater Mine; 1976-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Thomas M  Boyle et al → No 1 Strip Fitzwater Mine; 1976-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thomas M  Boyle et al → Mon River Dock Company; 1976-06-01 to current/open; source msha-controller-operator-history