# Relationship history for MSHA mine 1516051

Current hierarchy: **Blair Roy & Fred → R & F Mining Company Inc → No 1 Surface**

- 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:** R & F Mining Company Inc → No 1 Surface; 1987-05-01 to 1996-01-07; source msha-controller-operator-history
- **controller_controls_mine:** Blair Roy & Fred → No 1 Surface; 1987-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Blair Roy & Fred → R & F Mining Company Inc; 1987-05-01 to 1996-01-07; source msha-controller-operator-history
- **controller_controls_mine:** Brack  Baker et al → No 1 Surface; 1991-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Don Coal Company Inc → No 1 Surface; 1996-01-08 to 1996-10-10; source msha-controller-operator-history
- **controller_controls_mine:** Cunagin Donald → No 1 Surface; 1996-01-08 to 1996-10-10; source msha-controller-operator-history
- **controller_controls_operator:** Cunagin Donald → Don Coal Company Inc; 1996-01-08 to 1996-10-10; source msha-controller-operator-history
- **operator_operates_mine:** Hannco Energy Inc → No 1 Surface; 1996-10-11 to 1996-11-18; source msha-controller-operator-history
- **controller_controls_operator:** Brack  Baker et al → Hannco Energy Inc; 1996-10-11 to 1996-11-18; source msha-controller-operator-history
- **controller_controls_operator:** Timothy L  Fugate et al → Hannco Energy Inc; 1996-10-11 to 1996-11-18; source msha-controller-operator-history
- **operator_operates_mine:** R & F Mining Company Inc → No 1 Surface; 1996-11-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Blair Roy & Fred → R & F Mining Company Inc; 1996-11-19 to current/open; source msha-controller-operator-history