# Relationship history for MSHA mine 4405998

Current hierarchy: **Bobby Gene  Yates → Bless Coal Company Inc → No 2 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:** Sykes & Lambert Coal Company Inc → No 2 Mine; 1983-05-01 to 1985-02-05; source msha-controller-operator-history
- **controller_controls_mine:** Sykes Jack → No 2 Mine; 1983-05-01 to 1985-02-05; source msha-controller-operator-history
- **controller_controls_operator:** Sykes Jack → Sykes & Lambert Coal Company Inc; 1983-05-01 to 1985-02-05; source msha-controller-operator-history
- **controller_controls_mine:** Bobby Gene  Yates → No 2 Mine; 1984-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Bless Coal Company Inc → No 2 Mine; 1985-02-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bobby Gene  Yates → Bless Coal Company Inc; 1985-02-06 to current/open; source msha-controller-operator-history