# Relationship history for MSHA mine 3604547

Current hierarchy: **Thomas M  Boyle → B L F Corp → Millsboro No 1 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

- **operator_operates_mine:** B L F Corp → Millsboro No 1 Strip; 1973-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Thomas M  Boyle et al → Millsboro No 1 Strip; 1973-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thomas M  Boyle et al → B L F Corp; 1973-01-01 to current/open; source msha-controller-operator-history