# Relationship history for MSHA mine 3603346

Current hierarchy: **De Matteis Domenic → Sunbeam Coal Corp → Sunbeam**

- 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:** Sunbeam Coal Corp → Sunbeam; 1950-01-01 to 1985-07-24; source msha-controller-operator-history
- **controller_controls_mine:** Harger William → Sunbeam; 1950-01-01 to 1985-07-24; source msha-controller-operator-history
- **controller_controls_operator:** Harger William → Sunbeam Coal Corp; 1950-01-01 to 1985-07-24; source msha-controller-operator-history
- **operator_operates_mine:** Sunbeam Coal Corp → Sunbeam; 1985-07-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** De Matteis Domenic → Sunbeam; 1985-07-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** De Matteis Domenic → Sunbeam Coal Corp; 1985-07-25 to current/open; source msha-controller-operator-history