# Relationship history for MSHA mine 4606507

Current hierarchy: **Warf Bernard W Jr → Catlin Coal Company Inc → Sylvia Branch No 4 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

- **controller_controls_mine:** Hatfield Ewell → Sylvia Branch No 4 Mine; 1977-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sylvia Branch Coal Corp → Sylvia Branch No 4 Mine; 1982-01-01 to 1983-11-08; source msha-controller-operator-history
- **controller_controls_operator:** Hatfield Ewell → Sylvia Branch Coal Corp; 1982-01-01 to 1983-11-08; source msha-controller-operator-history
- **operator_operates_mine:** H & S Mining Inc → Sylvia Branch No 4 Mine; 1983-11-09 to 1985-01-02; source msha-controller-operator-history
- **controller_controls_mine:** William  Smith et al → Sylvia Branch No 4 Mine; 1983-11-09 to 1985-01-02; source msha-controller-operator-history
- **controller_controls_operator:** William  Smith et al → H & S Mining Inc; 1983-11-09 to 1985-01-02; source msha-controller-operator-history
- **controller_controls_mine:** Warf Bernard W Jr → Sylvia Branch No 4 Mine; 1984-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Catlin Coal Company Inc → Sylvia Branch No 4 Mine; 1985-01-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Warf Bernard W Jr → Catlin Coal Company Inc; 1985-01-03 to current/open; source msha-controller-operator-history