# Relationship history for MSHA mine 3605050

Current hierarchy: **Thomas M  Boyle → Mon River Dock Company → Mon River Dock**

- 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:** Thomas M  Boyle et al → Mon River Dock; 1973-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** B L F Corp → Mon River Dock; 1974-03-19 to 1978-10-24; source msha-controller-operator-history
- **controller_controls_operator:** Thomas M  Boyle et al → B L F Corp; 1974-03-19 to 1978-10-24; source msha-controller-operator-history
- **controller_controls_mine:** Thomas M  Boyle et al → Mon River Dock; 1976-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mon Valley Transportation Company → Mon River Dock; 1978-10-25 to 1981-10-26; source msha-controller-operator-history
- **controller_controls_mine:** Usx Corp → Mon River Dock; 1978-10-25 to 1981-10-26; source msha-controller-operator-history
- **controller_controls_operator:** Usx Corp → Mon Valley Transportation Company; 1978-10-25 to 1981-10-26; source msha-controller-operator-history
- **operator_operates_mine:** Mon River Dock Company → Mon River Dock; 1981-10-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thomas M  Boyle et al → Mon River Dock Company; 1981-10-27 to current/open; source msha-controller-operator-history