# Relationship history for MSHA mine 3603095

Current hierarchy: **Farley William J → Sun Coal Company → Excelsiar Strip 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Bridy Inc → Excelsiar Strip Mine; 1950-01-01 to 1973-12-20; source msha-controller-operator-history
- **controller_controls_mine:** Bridy Victor F → Excelsiar Strip Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bridy Victor F → Bridy Inc; 1950-01-01 to 1973-12-20; source msha-controller-operator-history
- **controller_controls_mine:** Farley William J → Excelsiar Strip Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sun Coal Company → Excelsiar Strip Mine; 1973-12-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Farley William J → Sun Coal Company; 1973-12-21 to current/open; source msha-controller-operator-history