# Relationship history for MSHA mine 3604622

Current hierarchy: **Tassone Joseph P → Mon-West Enterprises → Masontown 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

- **operator_operates_mine:** J & C Loading Company → Masontown Dock; 1950-01-01 to 1987-12-20; source msha-controller-operator-history
- **controller_controls_mine:** Valentine James & Charles F Speggen → Masontown Dock; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Valentine James & Charles F Speggen → J & C Loading Company; 1950-01-01 to 1987-12-20; source msha-controller-operator-history
- **operator_operates_mine:** Mon-West Enterprises → Masontown Dock; 1987-12-21 to 1990-05-14; source msha-controller-operator-history
- **controller_controls_mine:** Tassone Joseph P → Masontown Dock; 1987-12-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tassone Joseph P → Mon-West Enterprises; 1987-12-21 to 1990-05-14; source msha-controller-operator-history
- **operator_operates_mine:** Advantage Fuels Inc → Masontown Dock; 1990-05-15 to 1991-01-24; source msha-controller-operator-history
- **controller_controls_mine:** Rose C Edward → Masontown Dock; 1990-05-15 to 1991-01-24; source msha-controller-operator-history
- **controller_controls_operator:** Rose C Edward → Advantage Fuels Inc; 1990-05-15 to 1991-01-24; source msha-controller-operator-history
- **operator_operates_mine:** Mon-West Enterprises → Masontown Dock; 1991-01-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tassone Joseph P → Mon-West Enterprises; 1991-01-25 to current/open; source msha-controller-operator-history