# Relationship history for MSHA mine 2600891

Current hierarchy: **Foss Ted → Norse Windfall Mines Inc → Norse Windfall Mines Incorporated**

- 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:** Windfall Venture → Norse Windfall Mines Incorporated; 1950-01-01 to 1981-03-09; source msha-controller-operator-history
- **controller_controls_mine:** Wilson William L Et Al → Norse Windfall Mines Incorporated; 1950-01-01 to 1986-11-10; source msha-controller-operator-history
- **controller_controls_operator:** Wilson William L Et Al → Windfall Venture; 1950-01-01 to 1981-03-09; source msha-controller-operator-history
- **operator_operates_mine:** Western-Windfall Ltd → Norse Windfall Mines Incorporated; 1981-03-10 to 1983-11-21; source msha-controller-operator-history
- **controller_controls_mine:** Western Gas Oil & Mining Ltd & Windfall Venture → Norse Windfall Mines Incorporated; 1981-03-10 to 1983-11-21; source msha-controller-operator-history
- **controller_controls_operator:** Western Gas Oil & Mining Ltd & Windfall Venture → Western-Windfall Ltd; 1981-03-10 to 1983-11-21; source msha-controller-operator-history
- **operator_operates_mine:** Windfall Venture → Norse Windfall Mines Incorporated; 1983-11-22 to 1986-11-10; source msha-controller-operator-history
- **controller_controls_operator:** Wilson William L Et Al → Windfall Venture; 1983-11-22 to 1986-11-10; source msha-controller-operator-history
- **operator_operates_mine:** Norse Windfall Mines Inc → Norse Windfall Mines Incorporated; 1986-11-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Foss Ted → Norse Windfall Mines Incorporated; 1986-11-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Foss Ted → Norse Windfall Mines Inc; 1986-11-11 to current/open; source msha-controller-operator-history