# Relationship history for MSHA mine 2000750

Current hierarchy: **Fetke Harry → Harry Fetke & Sons Contractors → Silver Creek Pit**

- 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:** Yerington Construction Company → Silver Creek Pit; 1950-01-01 to 1983-04-09; source msha-controller-operator-history
- **controller_controls_mine:** John G  Yerington → Silver Creek Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John G  Yerington → Yerington Construction Company; 1950-01-01 to 1983-04-09; source msha-controller-operator-history
- **controller_controls_mine:** Yerington John G (Estate) & G W Heppler → Silver Creek Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Yerington Construction Company → Silver Creek Pit; 1983-04-10 to 1991-02-28; source msha-controller-operator-history
- **controller_controls_operator:** Yerington John G (Estate) & G W Heppler → Yerington Construction Company; 1983-04-10 to 1991-02-28; source msha-controller-operator-history
- **operator_operates_mine:** Harry Fetke & Sons Contractors → Silver Creek Pit; 1991-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Fetke Harry → Silver Creek Pit; 1991-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fetke Harry → Harry Fetke & Sons Contractors; 1991-03-01 to current/open; source msha-controller-operator-history