# Relationship history for MSHA mine 1516702

Current hierarchy: **Duncan Ralph E → Duncan - Duncan & Duncan → M & N #5**

- 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:** Group Fuels Inc → M & N #5; 1989-08-01 to 1990-01-17; source msha-controller-operator-history
- **controller_controls_mine:** P Ron  Siler → M & N #5; 1989-08-01 to 1990-01-17; source msha-controller-operator-history
- **controller_controls_operator:** P Ron  Siler → Group Fuels Inc; 1989-08-01 to 1990-01-17; source msha-controller-operator-history
- **operator_operates_mine:** Duncan - Duncan & Duncan → M & N #5; 1990-01-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Duncan Ralph E Et Al → M & N #5; 1990-01-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Duncan Ralph E Et Al → Duncan - Duncan & Duncan; 1990-01-18 to current/open; source msha-controller-operator-history